雅克拉断凸东段侏罗系-白垩系地层超覆圈闭预测
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摘要
雅克拉断凸东段位于库车坳陷前缘斜坡带,侏罗系-白垩系向南超覆于前中生界凸起基底之上,形成了一系列地层超覆圈闭。由于大部分侏罗系-白垩系上超尖灭体不同程度地与前中生界区域性不整合(T50)下伏的不同地层接触,地层超覆圈闭的有效性受控于下伏地层的致密程度。利用地震属性、钻井资料和三维地震剖面相结合的方法对T05区域不整合下伏地层的分布、岩性和封堵性进行了分析,按封堵性将它们分为3种类型:下寒武统玉尔吐斯组-震旦系泥岩、泥质白云岩为封堵性底板,元古宇变质岩、中上寒武统白云岩和石炭系砂泥岩为可能封堵性底板,具溶蚀特征的中上寒武统白云岩和元古宇变质岩为渗透性储层底板。通过二维正演地质模型分析佐证了这3类不同封堵性能地层的地震识别特征。综合分析认为Jse3旋回、Kse1旋回以及Jse1旋回在DG2井附近可形成可观的、有效的地层超覆圈闭。
The east part of Yakela fault arch is located in the frontal uplift of Kuqa Depression.Jurassic-Cretaceous formation southward onlapped the pre-Mesozoic uplift basement,formed a series of stratigraphic overlap traps.However,most of Jurassic-Cretaceous onlap units are related to different underlaying formations under the pre-Mesozoic regional unconformity T05 in different degree.Sealing property of the underlaying formations directly infleunces the effectiveness of traps.Based on seismic attributes,well calibration and 3-D seismic sections,the distribution,lithology and sealing property of underlaying formations under T05 unconformity are divided into three types.Mudstone and argillaceous dolomite from Lower Cambrian Yuertus Formation to Sinian are good sealing floors.Proterozoic metamorphic rock,Mid-Upper Cambrian dolomite,and Carboniferous sand-mudstone are possible sealing floors.Mid-Upper Cambrian karst dolomite and Proterozoic dissolved metamorphic rock are permeable reservoir floors.Model analysis further verifies the seismic identification characteristics of this three lithologies.It is concluded that Jse3,Kse1 and Jse1 cycle near DG2 are likely to form appreciable and effective stratigraphic overlap traps.
The east part of Yakela fault arch is located in the frontal uplift of Kuqa Depression.Jurassic-Cretaceous formation southward onlapped the pre-Mesozoic uplift basement,formed a series of stratigraphic overlap traps.However,most of Jurassic-Cretaceous onlap units are related to different underlaying formations under the pre-Mesozoic regional unconformity T05 in different degree.Sealing property of the underlaying formations directly infleunces the effectiveness of traps.Based on seismic attributes,well calibration and 3-D seismic sections,the distribution,lithology and sealing property of underlaying formations under T05 unconformity are divided into three types.Mudstone and argillaceous dolomite from Lower Cambrian Yuertus Formation to Sinian are good sealing floors.Proterozoic metamorphic rock,Mid-Upper Cambrian dolomite,and Carboniferous sand-mudstone are possible sealing floors.Mid-Upper Cambrian karst dolomite and Proterozoic dissolved metamorphic rock are permeable reservoir floors.Model analysis further verifies the seismic identification characteristics of this three lithologies.It is concluded that Jse3,Kse1 and Jse1 cycle near DG2 are likely to form appreciable and effective stratigraphic overlap traps.
引文
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[20]张学丰,刘波,蔡忠贤,等.白云岩化作用与碳酸盐岩储层物性[J].地质科技情报,2010,29(3):79-85.
[2]康玉柱,张文杜,周棣康,等.中国塔里木盆地石油地质特征及资源评价[M].北京:地质出版社,1996.
[3]何发岐,梅廉夫,费琪.前陆盆地前缘隆起带圈闭的形成及其含油气性:以塔里木盆地沙雅隆起为例[J].石油实验地质,2006,25(5):418-423.
[4]周小进,陈跃,黄继文,等.库车坳陷南缘地层超覆圈闭特征及含油气前景[J].石油实验地质,2000,22(1):40-45.
[5]赵熬山,蔡星,孟晓丽,等.非构造圈闭:雅克拉断凸寻找油气藏的新领域[J].新疆石油地质,2000,21(6):456-458.
[6]高岩,赵秀岐,张玮,等.塔里木盆地层序地层特征与非构造圈闭勘探[M]∥佚名.塔里木盆地石油地质与勘探丛书.北京:石油工业出版社,2003:192-258.
[7]周新源,王清华,肖中尧.新疆南天山山前地区中生界成藏条件及勘探潜力[J].地质科学,2004,39(4):463-474.
[8]胡见义,徐树宝,刘淑萱,等.非构造油气藏[M].北京:石油工业出版社,1986:29-144.
[9]Castagna J P,Sun S.Instantaneous spectral analysis:Dectec-tion of low frequency shadows associated with hydrocarbons[J].The Leading Edge,2003,22(2):120-127.
[10]蒲仁海,郑显华,袁丽珍,等.论非构造油气藏综合勘探方法[J].西北大学学报:自然科学版,1998,28(6):522-526.
[11]Deng Zhiwen,Zou Xuefeng,Bai Xuming,et al.New geo-physical techniques for oil and gas reservoir evaluation in east-ern China[J].The Leading Edge,2007,26(3):284-293.
[12]江涛,苗洪波,王芳,等.松辽盆地西部盆缘带地层超覆油藏形成条件[J].大庆石油地质与开发,2006,25(4):24-26.
[13]万方,崔文彬,李士超.RMS提取技术在溶洞型碳酸盐岩储层地质建模中的应用[J].现代地质,2010,24(2):279-293.
[14]刘传虎.地震属性与非构造油气藏勘探[J].新疆石油地质,2005,26(5):485-488.
[15]Chen Q,Steve S.Seismic attribute technology for reservoirforecasting and monitoring[J].The Leading Edge,1997,16(5):445-456.
[16]胡伟光.相干体技术在川东北油气勘探中的应用[J].物探化探计算技术,2010,32(3):260-264.
[17]Bahorieh M,Farmer S.3-D seismic discontinuity for faultsand stratigraphic features:The coherence cubs[J].The Lead-ing Edge,1995,14(10):1053-1058.
[18]韩强,杨子川,赵渊.塔里木盆地轮台地区低幅度构造圈闭落实技术及其应用[J].石油与天然气地质,2010,31(1):43-48.
[19]周新桂,孙宝珊,徐宏节,等.雅克拉—轮台地区变形特征及控油作用研究[J].地质力学学报,2001,7(1):33-39.
[20]张学丰,刘波,蔡忠贤,等.白云岩化作用与碳酸盐岩储层物性[J].地质科技情报,2010,29(3):79-85.
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