四川盆地东北部元坝地区中三叠统雷口坡组四段古岩溶特征及其油气地质意义
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摘要
四川盆地东北部元坝地区雷口坡组四段中的油气突破显示了其重要的油气地质意义。通过对野外露头、岩心、薄片、阴极发光、钻井、录井、测井和地震资料的综合分析,认为研究区发育地表残积相、洞穴垮塌堆积相、地下暗河搬运充填相、基岩溶蚀破裂相、基岩溶蚀相和基岩溶蚀交代相6种岩溶相类型。根据不同岩溶带的水动力作用特征,由上而下将其分为地表岩溶带、垂直渗流带、水平潜流带和深部岩溶带。以上部地层印模法为主并结合雷口坡组的残余地层分布、风化壳厚度发育情况恢复古岩溶地貌,进一步刻画元坝地区的微地貌情况,认为岩溶斜坡为最有利的储层发育地貌单元,其中以中上斜坡更优,岩溶残丘为最有利的储层发育微地貌单元。古岩溶对雷口坡组四段储层的形成具有重要的作用,有利储层的平面和纵向发育、分布受古岩溶作用特征的控制。
The hydrocarbon breakthrough in the 4th member of the Leikoupo Formation shows important geological significance for petroleum exploration.Based on comprehensive analyses composed of outcrop and drill-core observations,thin-section petrographic examinations,well log analysis,fluid inclusion studies,and carbon,oxygen,strontium isotopic composition measurements,the authors divided paleokarst faces of the study area into six types,i.e.,surface eluvium,speleothem composed of break-down clasts,fillings from underground rivers,crack of base rock,solution of base rock,and dissolution and replacement of base rock.According to hydrodynamic conditions,the paleokarstification can be divided in descending order into surface-karst zone,vertical vadose zone,horizontal phreatic zone and deep-karst zone.Using the impression method and based on the distribution characteristics of relict stratum,the authors restored palaeokarst geomorphology for the 4th Member of the Leikoupo Formation and presented more details of micro-geomorphology for Yuanba area.It is held that karst slope is the most advantageous geomorphic unit for the formation of reservoirs,with the most favorable place being middle-upper slope.Karst hammock is the most advantageous micro-geomorphic units for the formation of reservoirs.Paleokarstification plays an important role in the reservoir formation of 4th Member of Leikoupo Formation and its features control the distribution of favorable reservoirs in both vertical and planar directions.
引文
[1]陈学时,易万霞,卢文忠.中国油气田古岩溶与油气储层[J].沉积学报,2004,22(2):244-253.
    [2]顾忆.塔里木盆地北部塔河油田油气藏成藏机制[J].石油实验地质,2002,22(4):307-312.
    [3]周玉琦,黎玉战,侯鸿斌.塔里木盆地塔河油田的勘探实践与认识[J].石油实验地质,2001,23(4):363-367.
    [4]罗平,张静,刘伟,等.中国海相碳酸盐岩油气储层基本特征[J].地学前缘,2008,15(1):36-50.
    [5]四川省地质矿产局.四川省区域地质志[M].北京:地质出版社,1991:561-601.
    [6]刘树根,汪华,孙玮,等.四川盆地海相领域油气地质条件专属性问题分析[J].石油与天然气地质,2008,29(6):781-792.
    [7]汪华,刘树根,秦川,等.四川盆地中西部雷口坡组油气地质条件及勘探方向探讨[J].成都理工大学学报(自然科学版),2009,36(6):669-674.
    [8]马永生,陈洪德,王国立,等.中国南方层序地层与古地理[M].北京:科学出版社,2009:310-311.
    [9]Jamed N P,Choquette P W.Paleokarst[M].Springer Verlag,NewYork,1988.
    [10]袁志祥.鄂尔多斯盆地塔巴庙地区奥陶系风化壳岩溶相特征[J].成都理工学院学报,2002,29(3):179-285.
    [11]Esteban M.Paleokarst facies analysis:deneral trends and Cretaceousoccurrences[J].Cuadernos ed Geologia Iberica,1993,17:81-82.
    [12]蒋春雷,金振奎.塔中地区寒武—奥陶系地层岩溶相研究[J].石油天然气学报(江汉石油学院学报),2009,31(5):161-165.
    [13]郑荣才,彭军,高红灿.渝东黄龙组碳酸盐岩储层的古岩溶特征和岩溶旋回[J].地质地球化学,2003,31(1):28-36.
    [14]苏中堂,陈洪德,林良彪,等.鄂尔多斯盆地塔巴庙地区奥陶系古岩溶发育特征及储层意义[J].新疆地质,2010,28(2):180-185.
    [15]庞艳君,代宗仰,刘善华,等.川中乐山-龙女寺隆起奥陶系古岩溶发育地质因素分析[J].重庆科技学院学报(自然科学版),2007,9(3):1-4.
    [16]陈清华,刘池阳,王书香,等.碳酸盐岩缝洞系统研究现状与展望[J].石油与天然气地质,2002,23(2):196-202.
    [17]文华国,郑荣才,沈忠民,等.四川盆地东部黄龙组古岩溶地貌研究[J].地质论评,2009,55(6):826-827.
    [18]何发岐.碳酸盐岩地层中不整合-岩溶风化壳油气田[J].地质论评,2002,48(4):391-397.
    [19]罗冰,谭秀成,李凌,等.蜀南地区长兴组顶部岩溶不整合的发现及其油气地质意义[J].石油学报,2010,31(3):408-414.
    ①张国伟,等.中国中上扬子(南方)大陆构造与海相油气前景.西北大学,2009.
    ②傅恒,等.川东北元坝地区三叠系中统雷口坡组四段上亚段储层研究.成都理工大学,2010.

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