四川盆地龍王廟組優(yōu)質(zhì)儲層形成與分布的主控因素

1、四川盆地龍王廟組優(yōu)質(zhì)儲層形成與分布的主控因素劉樹根1, 宋金民1, 趙異華2, 鐘勇1, 宋林珂2, 田艷紅1, 梁鋒2, 尹柯惟1, 李俊良2(1.油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實驗室(成都理工大學(xué))，成都 610059;2.中國石油西南油氣田公司川中油氣礦, 四川 遂寧 629001)摘要 下寒武統(tǒng)龍王廟組是四川盆地安岳特大型氣田的主力儲層。本文基于盆地周緣露頭、鉆井巖心和薄片資料，通過龍王廟組地層對比、儲層巖石學(xué)、物性特征、成巖作用等的研究，探討了龍王廟組儲層形成分布的控制因素。四川盆地龍王廟組整體上具有可對比性，儲層巖性主要為粉-細(xì)晶（殘余）砂屑白云巖、粉-細(xì)晶（殘余）鮞粒白云巖、粉-細(xì)

2、晶白云巖。儲層屬于中低孔低滲型。孔隙度2%的儲層厚度多在2060 m，川中磨溪地區(qū)較高石梯地區(qū)厚，向西北方向剝蝕，向東南方向厚度減小。龍王廟組儲層形成和分布主要受控于3個因素：拉張槽繼承性古地貌、同生期喀斯特作用和液態(tài)烴充注作用。拉張槽斷層下盤形成的古地貌高地控制了龍王廟組顆粒灘的發(fā)育；同生期大氣淡水溶蝕作用形成粒間溶孔和粒內(nèi)溶孔，為后期成巖流體的進(jìn)入和溶蝕孔洞的擴(kuò)溶奠定了基礎(chǔ)；生排烴高峰期的烴類充注作用，既能形成大量孔隙，又能對儲層起到積極的保持作用。綿陽長寧拉張槽東西兩側(cè)斷階形成的古地貌高地控制了龍王廟組早期優(yōu)質(zhì)儲層的形成和分布；中三疊世期間拉張槽內(nèi)下寒武統(tǒng)供烴中心與川中古隆起重疊地區(qū)是龍

3、王廟組晚期優(yōu)質(zhì)儲層最發(fā)育地區(qū)。四川盆地內(nèi)龍王廟組優(yōu)質(zhì)儲層最發(fā)育和天然氣大規(guī)模成藏最有利地區(qū)均是綿陽-長寧拉張槽與川中古隆起相重疊區(qū)的東側(cè)，即高石梯磨溪地區(qū)。關(guān)鍵詞 儲層；碳酸鹽巖；下寒武統(tǒng)；龍王廟組；控制因素；四川盆地Controlling factors of formation and distribution of Lower Cambrian Longwangmiao Formation high-quality reservoirs in Sichuan Basin, ChinaLIU Shu-gen1, SONG Jin-min1, ZHAO Yi-hua2, ZHONG Yong

4、1, SONG Lin-ke2, TIAN Yan-hong1, LIANG Feng2, YIN Ke-wei1, LI Jun-liang21.State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu University of Technology, Chengdu 610059, China;2.Central Sichuan Mining District, Southwest Oil and Gas Field Branch Company of CNPC, Suining 6290

5、01, ChinaAbstract: The Lower Cambrian Longwangmiao Formation is the play of the Anyue supergiant gas field in Sichuan Basin. Based on the integrated study of the outcrops on the basin margin and the drilling cores in Sichuan Basin, this paper discusses the controlling factors of the formation and di

6、stribution of the high-quality reservoirs of the Longwangmiao Formation through the researches on the strata correlation, reservoir petrology, property characteristics and diagenesis etc. The Longwangmiao Formation could be well correlated in the basin scale, and the reservoir rocks are composed of

7、dolarenite dolomite, oolitic dolomite and crystalline dolomite. The reservoir is of the pore-fracture type with low porosity and low permeability. The reservoir thickness with the porosity over 2% is about 2060 m. The reservoir in the Moxi area is much thicker than that in the Gaoshiti area. The pen

8、econtemporaneous selective fresh water dissolution and liquid hydrocarbon filling have been controlled by the Early Cambrian Mianyang-Changning intracratonic sag to a certain extent. Three factors control the formation and distribution of the good-quality reservoir rocks in Longwangmiao Formation, t

9、hat is, the inherited palaeogeomorphology of the intracratonic sag, the contemporaneous karst and the liquid hydrocarbon filling. The paleohigh formed by the footwall of margin fault of the intracratonic sag controls the distribution of the grain bank of Longwangmiao Formation. The intergranular and

10、 intragranular dissolution pores produced by the contemporaneous atmospheric freshwater karstification are important for the upcoming fluid filling and further dissolution. The hydrocarbon filling at the peak period of the generation and expulsion of the source rocks is beneficial to the increase of

11、 pores and the protection of the previous pores. The paleohigh formed by the faults along the two sides of the Mianyang-Changning intracratonic sag controls the formation and distribution of the early high-quality reservoirs, and the overlapping areas of the Lower Cambrian hydrocarbon-generating cen

12、ter and the Chuanzhong paleouplift are the most favorable areas of the late good-quality reservoirs. The most profitable areas for the distribution of the high-quality reservoir rocks and natural gas accumulations in Longwangmiao Formation are the eastern part of the overlapping areas of the Mianyan

13、g-Changning intracratonic sag and the Chuanzhong paleouplift, that is, the Gaoshiti-Moxi area.Key words: reservoirs; carbonate; Lower Cambrian; Longwangmiao Formation; controlling factor; Sichuan Basin四川盆地中部龍王廟組儲層成巖作用田艷紅1, 劉樹根1, 趙異華2, 宋金民1, 宋林珂2, 孫瑋1, 梁鋒2, 張長俊1, 李俊良2, 尹柯惟1, 王晨霞1, 吳娟1, 林彤1, 白志強(qiáng)1, 彭瀚霖

14、1, 陳會芝1（1.油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實驗室（成都理工大學(xué)），成都 610059;2.中國石油 西南油氣田公司 川中油氣礦, 四川 遂寧 629001）摘要 四川盆地中部地區(qū)下寒武統(tǒng)龍王廟組是油氣勘探研究的重點(diǎn)層位。根據(jù)鉆井資料、測井?dāng)?shù)據(jù)、巖心觀察、普通薄片、鑄體薄片、陰極發(fā)光、碳氧穩(wěn)定同位素和主元素等分析，對龍王廟組儲層成巖作用進(jìn)行了研究，結(jié)果表明為顆粒白云巖和晶粒白云巖是龍王廟組主要的儲集巖性，成巖作用主要有建設(shè)性、破壞性和保持性。建設(shè)性成巖作用主要包括溶蝕、破裂和烴類(有機(jī)酸)充注作用，破壞性成巖作用主要包括壓實和壓溶作用，保持性成巖作用主要包括膠結(jié)、白云石化和泥晶化作用。揭示

15、了顆粒灘微相是龍王廟組優(yōu)質(zhì)碳酸鹽巖儲層發(fā)育的基礎(chǔ)條件，海水白云石化、準(zhǔn)同生期淡水溶蝕和烴類(有機(jī)酸)充注作用是優(yōu)質(zhì)儲層形成的關(guān)鍵因素。關(guān)鍵詞 四川盆地；下寒武統(tǒng)；龍王廟組；儲層；成巖作用Diagenesis of Lower Cambrian Longwangmiao Formation reservoirs in central area of Sichuan Basin, ChinaTIAN Yan-hong1, LIU Shu-gen1, ZHAO Yi-hua2, SONG Jin-min1, SONG Lin-ke2, SUN Wei1, LIANG Feng2, ZHANG Cha

16、ng-jun1, LI Jun-liang2, YIN Ke-wei1, WANG Chen-xia1, WU Juan1, LIN Tong1, BAI Zhi-qiang1, PENG Han-lin1, CHEN Hui-zhi11.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China; 2.Central Sichuan Oil & Gas Field of PetroChina Sou

17、thwest Oil & Gasfield Company, Suining 629001, ChinaAbstract: At present, the Lower Cambrian Longwangmiao Formation in the central area of Sichuan Basin is one of the most important reservoir rocks for oil and gas exploration. According to the analysis of the core and logging data, core observation,

18、 thin sections, casting sections, cathodoluminescence, carbon and oxygen isotopic data and major elements data, this paper studies the diagenesis of the Longwangmiao reservoir rocks. The results show that the granular dolomite and the crystalline dolomite are the main reservoir rocks, and there is c

19、onstructive diagenesis, destructive and retentive diagenesis in Longwangmiao Formation. The constructive diagenesis includes corrosion, fractures and hydrocarbon filling, the destructive diagenesis includes compaction and pressure solution, and the retention diagenesis includes cementation, dolomiti

20、zation and micritization. This paper reveals that the grain beach microfacies is the prerequisite of developing the Longwangmiao Formation high-quality reservoirs, and the seawater dolomitization, penecontemporaneous fresh-water dissolution and hydrocarbon (organic acids) filling are the key factors

21、 to form the high-quality reservoirs.Key words: Sichuan Basin; Lower Cambrian; Longwangmiao Formation; reservoir; diagenesis川中高石梯構(gòu)造燈影組油氣成藏過程王國芝, 劉樹根, 劉偉, 范蕾, 袁海鋒（油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實驗室（成都理工大學(xué)），成都 610059）摘要 油氣儲層中不同時期所充填的礦物和流體包裹體可以揭示油氣的成藏過程。四川盆地高石梯構(gòu)造震旦系燈影組儲層至少有3期礦物充填：白云石瀝青石英/白云石+石英。早期的白云石中富含油包裹體;晚期的石英中富含液態(tài)

22、甲烷包裹體，烴類包裹體的捕獲壓力為79.498.12 MPa，壓力系數(shù)為1.351.88,顯示超壓特征?，F(xiàn)今氣藏的壓力系數(shù)為1.061.13。高石梯氣藏具有多期成藏特點(diǎn)，屬于構(gòu)造調(diào)整氣藏。其可能的成藏過程為：二疊紀(jì)-三疊紀(jì)末期，古油藏形成；侏羅紀(jì)-晚白堊世，古油藏中的石油在原位開始裂解形成超壓古氣藏；喜馬拉雅早期，古氣藏向資陽-威遠(yuǎn)方向遷移和被破壞；喜馬拉雅中晚期，磨溪地區(qū)的古氣藏遷移調(diào)整至高石梯地區(qū)重新成藏。在調(diào)整成藏過程中，氣藏具有從超壓向常壓演變的特征。古氣藏的破壞、側(cè)向遷移和重新聚集成藏，可能主要受構(gòu)造演化和構(gòu)造高點(diǎn)的側(cè)向遷移控制。關(guān)鍵詞 四川盆地；高石梯構(gòu)造；燈影組；超壓；油氣成藏P

23、rocess of hydrocarbon accumulation of Sinian Dengying Formation in Gaoshiti structure, Central Sichuan, ChinaWANG Guo-zhi, LIU Shu-gen, LIU Wei, FAN Lei, YUAN Hai-fengState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaAbstra

24、ct: The process of hydrocarbon accumulation can be revealed by the different minerals and fluid inclusions filled at different stages in the reservoirs. At least three generations of mineral filling can be identified in the Sinian Dengying Formation reservoir in the Gaoshiti structure of Central Sic

25、huan. They are dolomitebitumenquartz/dolomite+quartz. The early dolomite and later quartz are rich in oil inclusions and liquid CH4 inclusions, respectively. The trapping pressure (79.498.12 MPa) and the pressure coefficient (1.351.88) of CH4 inclusions in the quartz indicate that the ancient gas po

26、ols are characterized by overpressure. The pressure coefficient of the present gas pools is 1.061.13. The research indicates that the Gaoshiti gas pool is characterized by multi-phase hydrocarbon accumulation and belongs to a tectonic adjustment gas pool. A possible process of hydrocarbon accumulati

27、on can be suggested as follows. (1) The ancient oil pool formed during Permian-the end of Triassic; (2) The petroleum thermal cracking in situ resulted in the development of ancient overpressure gas pools during Jurassic-Late Cretaceous; (3) The gas in the ancient gas pools migrated toward the Ziyan

28、g-Weiyuan and the ancient gas pools were destroyed in the early Himalaya period; (4) The gas from the Moxi ancient gas pools migrated to Gaoshiti structure and reformed new gas pools there in the middle-late Himalaya period. The pressure of gas pools decreased from overpressure to normal pressure du

29、ring the adjustment and re-accumulation of hydrocarbon. The tectonic evolution and the lateral migration of the structural crest were responsible for the lateral migration and the destruction of the ancient gas pools and re-accumulation of hydrocarbon. Key words: Sichuan Basin; Gaoshiti structure; D

30、engying Formation; overpressure; gas pool; hydrocarbon accumulation川中磨溪構(gòu)造寒武系龍王廟組油氣運(yùn)聚期次袁海鋒, 趙明霞, 王國芝, 宋金民, 劉勇, 付晨陽, 王維華, 杜威(油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實驗室(成都理工大學(xué))，成都 610059)摘要 借助鉆井巖心與薄片觀察、包裹體均一溫度測定與地球化學(xué)分析等技術(shù)手段，結(jié)合儲層熱演化歷史恢復(fù)成果，對川中磨溪構(gòu)造寒武系龍王廟組儲層特征、孔洞縫充填礦物的次序關(guān)系進(jìn)行分析，并恢復(fù)龍王廟組油氣運(yùn)聚期次。研究結(jié)果表明，儲層巖石類型主要為晶粒殘余砂屑白云巖，儲集空間以粒間孔、晶間孔為主

31、，但基質(zhì)的孔隙度和滲透率均較低。儲層孔、洞、縫中礦物的充填次序和類型及不同期次包裹體發(fā)育特征反映龍王廟組儲層至少經(jīng)歷了4期油氣成藏，第一期油氣成藏發(fā)生在中-晚三疊世，被細(xì)晶-微晶白云石中均一溫度為110133的包裹體所記錄；第二期油氣充注發(fā)生在早-中侏羅世，被孔洞中的第一世代白云石中均一溫度為143167的包裹體記錄；第三期油氣成藏為古油藏在高溫作用下裂解為天然氣的過程，被儲層孔洞縫中充填的第二世代瀝青所記錄；第四期油氣充注發(fā)生在中-晚白堊世，被第三世代石英中均一溫度為190210的流體包裹體記錄。這些不同期次和不同世代的礦物記錄了磨溪構(gòu)造龍王廟組油氣成藏流體充注完整的序列和過程。關(guān)鍵詞 磨溪

32、構(gòu)造；龍王廟組；充填序列；運(yùn)聚期次Phases of hydrocarbon migration and accumulation in Cambrian Longwangmiao Formation of Moxi structure, Central Sichuan, ChinaYUAN Hai-feng, ZHAO Ming-xia, WANG Guo-zhi, SONG Jin-min, LIU Yong, FU Chen-yang, WANG Wei-hua, DU WeiState Key Laboratory of Oil and Gas Reservoir Geology an

33、d Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaAbstract: With the aid of the technology of core research, thin section identification, homogenization temperature measurement and geochemical analysis, and combined with the recovery result of the heat evolutionary history of th

34、e Moxi structure reservoir in Central Sichuan, this paper analyzes the filling sequence of the minerals in the rock holes, and recovers the accumulation phases of Cambrian Longwangmiao Formation. The result shows that the main reservoir rock type is residual dolarenite, and the main reservoir spaces

35、 are intercrystal and intergranular pores, but the porosity and permeability of the matrix are low. The sequence and types of minerals filling in the holes and cracks, and the development characteristics of the inclusions of different phases reflect that the Longwangmiao Formation reservoir has expe

36、rienced at least four phases hydrocarbon accumulation. The first time of hydrocarbon filling occurred in the Middle-Late Triassic, and it is recorded by the homogenization temperature (110133) of the inclusions in the fine grain-microcrystalline dolomite. The second time hydrocarbon charge occurred

37、in the Early-Middle Jurassic and is recorded by the homogenization temperature (143167) of the inclusions in the first generation of dolomite. The third time of hydrocarbon filling was a process that the ancient reservoir was cracked into gas under high temperature and is recorded by the second gene

38、ration bituminous minerals filling in the reservoir pore cracks. The fourth time of hydrocarbon filling occurred in the Middle-Late Cretaceous and is recorded by the homogenization temperature (190210) of the fluid inclusions in the third generation quartz. These different times and different genera

39、tions of minerals record the complete sequence and processes of the fluid filling in the hydrocarbon accumulation of the Longwangmiao Formation.Key words: Moxi structure; Longwangmiao Formation; filling sequence; hydrocarbon migration and accumulation川中古隆起構(gòu)造演化特征及其與早寒武世綿陽-長寧拉張槽的關(guān)系鐘勇1,2, 李亞林1, 張曉斌1, 劉

40、樹根2, 巫芙蓉1, 劉定錦1, 鄧小江1, 陳勝1, 楊飛1, 李小娟1, 蔣波1(1.中國石油 川慶鉆探工程有限公司 地球物理勘探公司，成都 610213；2.油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實驗室(成都理工大學(xué))，成都 610059)摘要 根據(jù)早寒武世綿陽-長寧拉張槽的發(fā)現(xiàn)，為深化對四川盆地基礎(chǔ)地質(zhì)的認(rèn)識開展相關(guān)構(gòu)造演化研究。通過震旦系頂界古構(gòu)造恢復(fù)，對比分析拉張槽分布范圍與各期川中古隆起分布范圍，研究了古隆起演化與拉張槽的關(guān)系。以拉張槽和古隆起為主體可將四川盆地劃分為12個區(qū)域。認(rèn)為川中地區(qū)的隆起是伴隨著早寒武世拉張槽由隆起轉(zhuǎn)換為凹陷演化形成的，川西南地區(qū)在晚震旦世拉張槽隆升剝蝕階段已具有

41、雛形。拉張槽東西兩側(cè)是相互獨(dú)立的構(gòu)造區(qū)域，印支期（晚三疊世）古隆起與拉張槽具有北東向聯(lián)合古隆起特征。此后演化特征仍具有差異性，特別是喜馬拉雅期至今的演化過程中，川西南地區(qū)的隆升幅度遠(yuǎn)大于川中地區(qū)，致使現(xiàn)今構(gòu)造特征表現(xiàn)為震旦系頂界構(gòu)造川西南與川中分別位于同一隆起構(gòu)造的高點(diǎn)和斜坡位置。因此，綿陽-長寧拉張槽對震旦系-下古生界原生油氣地質(zhì)條件的控制和川中古隆起對震旦系-下古生界古今油氣藏的形成、調(diào)整和保存具有控制作用。關(guān)鍵詞 四川盆地；川中古隆起；拉張槽；下古生界-震旦系；烴源巖Evolution characteristics of Central Sichuan palaeouplift and

42、 its relationship with Early Cambrian Mianyang-Changning intracratonic sagZHONG Yong1,2, LI Ya-lin1, ZHANG Xiao-bin1, LIU Shu-gen2, WU Fu-rong1, LIU Ding-jin1, DENG Xiao-jiang1, CHEN Sheng1, YANG Fei1, LI Xiao-juan1, JIANG Bo11.Sichuan Geophysical Company of CNPC Chuanqing Drilling Engineering Compa

43、ny Limited, Chengdu 610213, China;2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaAbstract: In the light of the findings of the early Cambrian Mianyang-Changning intracratonic sag, this paper makes a study related to th

44、e structure and evolution for further knowing the basic geology in Sichuan Basin. Based on the palaeotectonic reconstruction of the top of the Sinian strata and by comparing the ranges of the intracratonic sag and the paleouplift at various stages, the present paper deciphers the relationship betwee

45、n the Mianyang-Changning intracratonic sag and the Central Sichuan paleouplift. The result shows that Sichuan Basin can be classified into 12 areas based on the evolutionary characteristics of the intracratonic sag and the paleouplift. The paper proposes that the Central Sichuan paleouplift formed w

46、ith the evolution of the Cambrian intracratonic sag. The east side and west side of the intracratonic sag are independent tectonic regions, and only during Late Triassic period, they jointed a paleouplift. Their present structural features are the Southwest Sichuan uplift and the Central Sichuan upl

47、ift, respectively, especially resulting from the differential evolutions after the Himalayan period. Therefore, the Mianyang-Changning intracratonic sag controls the primary oil and gas geological conditions and the Central Sichuan paleouplift controls the formation, adjustment and preservation of t

48、he oil and gas reservoirs of the Lower Paleozoic-Sinian strata.Key words: Sichuan Basin; Central Sichuan paleouplift; intracratonic sag; Lower Paleozoic-Sinian; hydrocarbon source rock四川盆地高石梯磨溪構(gòu)造震旦系寒武系含氣層系流體特征吳娟1, 劉樹根1, 趙異華2, 孫瑋1, 宋林珂2, 宋金民1, 梁鋒2, 田艷紅1, 龍翼1, 李俊良2（1.油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實驗室（成都理工大學(xué)），成都 61005

49、9;2.中國石油西南油氣田分公司 川中油氣礦，遂寧629001）摘要 下寒武統(tǒng)龍王廟組上震旦統(tǒng)燈影組是川中高石梯磨溪構(gòu)造主要的含氣層系。以地層水化學(xué)資料和實測地層壓力為基礎(chǔ)，分析燈影組龍王廟組地層水化學(xué)特征和地層壓力分布，研究地層流體特征與油氣成藏的關(guān)系。結(jié)果顯示：地層水離子中Cl-、K+Na+和Ca2+占絕對優(yōu)勢，以CaCl2型地層水為主，總礦化度高，變質(zhì)程度深，封閉性好，還原性強(qiáng)，對油氣聚集和保存十分有利。根據(jù)壓力系數(shù)分布特征將龍王廟組-燈影組劃分為龍王廟組異常高壓帶、燈四段-燈二段上部常壓帶和燈二段下部異常低壓帶。天然氣高產(chǎn)區(qū)與地層水礦化度高值區(qū)以及超壓分布區(qū)具有良好的對應(yīng)關(guān)系，壓力系數(shù)

50、對天然氣產(chǎn)量的影響尤為明顯。關(guān)鍵詞 四川盆地；高石梯磨溪構(gòu)造；震旦系寒武系；地層水；超壓Fluid characteristics of Upper Sinian-Lower Cambrian petroliferous strata in Gaoshiti-Moxi structure of Sichuan Basin, ChinaWU Juan1, LIU Shu-gen1, ZHAO Yi-hua2, SUN Wei1, SONG Lin-ke2, SONG Jin-min1, LIANG Feng2, TIAN Yan-hong1, LONG Yi1, LI Jun-liang21.S

51、tate Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;2.Central Sichuan Mining District, Southwest Oil and Gas Field Branch Company of CNPC, Suining 629001, ChinaAbstract: The Upper Sinian Dengying Formation and Lower Cambrian

52、Longwangmiao Formation are the main gas-bearing strata in the Gaoshiti-Moxi structure of Central Sichuan. Depending on the hydrochemical data and the measured pressure, this paper analyzes the hydrochemical characteristics and pressure distribution, and studies the relationship between the fluid cha

53、racteristics and the hydrocarbon accumulation. The hydrochemical characteristics show that the major water ions are Cl-, K+ Na+ and Ca2+. CaCl2 is the main type of the formation water in the study area. The formation water has high salinity, deep metamorphose degree, good sealing and strong reducibi

54、lity. All these conditions are very favorable for hydrocarbon accumulation and preservation. According to the pressure coefficient distribution, the Dengying Formation-Longwangmiao Formation can be divided into three zones, that, the overpressure zone in the Longwangmiao Formation, the normal pressu

55、re zone in Member 4 of Dengying Formation to the upper part of Member 2 of the Dengying Formation and the subpressure zone in the lower part of Member 2 of the Dengying Formation. The high gas production area has a positive correlation with high formation water salinity area and overpressure area, a

56、nd the influence of the pressure coefficients on the gas production is especially evident.Key words: Sichuan Basin; Gaoshiti-Moxi structure; Sinian-Cambrian; formation water; overpressure川中磨溪構(gòu)造龍王廟組流體包裹體特征及其地質(zhì)意義劉偉, 王國芝, 劉樹根, 范蕾, 和秀蓉（油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實驗室(成都理工大學(xué)),成都 610059）摘要 對四川盆地磨溪構(gòu)造下寒武統(tǒng)龍王廟組儲層中所充填石英與瀝青的

57、關(guān)系、石英中流體包裹體進(jìn)行綜合研究，探討油氣藏的成藏過程。通過對龍王廟組儲層白云巖標(biāo)本觀察、石英中流體包裹體的鏡下分析、顯微測溫表明，形成于石油熱裂解后的石英流體包裹體主要為氣液H2O包裹體、烴-H2O包裹體和純甲烷包裹體。氣液H2O包裹體的均一溫度峰值為210230，純甲烷包裹體的密度為0.214 80.299 7 g/cm3，流體的捕獲壓力為73.10153.74 MPa，峰值為100.00135.00 MPa，顯示明顯的超壓特征。說明古氣藏保存條件較好，現(xiàn)今氣藏仍舊具有超壓特征，應(yīng)為古氣藏經(jīng)調(diào)整后重新聚集成藏的結(jié)果。關(guān)鍵詞 磨溪構(gòu)造；龍王廟組；流體包裹體；超壓；成藏Characteris

58、tics and geological significance of fluid inclusions in Longwangmiao Formation of Moxi structure in Central Sichuan, ChinaLIU Wei, WANG Guo-zhi, LIU Shu-gen, FAN Lei, HE Xiu-rongState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059,

59、ChinaAbstract: This paper studies the relations between quartz and bitumen, and the fluid inclusions in the quartz from the Lower Cambrian Longwangmiao Formation of the Moxi structure, in order to approach the oil and gas accumulation process. The research result shows that the types of the fluid in

60、clusions formed after the oil thermal cracking are saline aqueous inclusion, hydrocarbon-aqueous inclusion and methane inclusion. The peak homogenization temperature of saline aqueous inclusions is 210230, and the density of methane inclusions is 0.21480.2997 g/cm3. Using the homogenization temperat