塔河油田下寒武统肖尔布拉克组构造控制热液白云岩储层分布与勘探前景  

Distribution and Exploration Prospect of Structurally Controlled Hydrothermal Dolomite Reservoir in Xiaoerbulake Formation of Lower Cambrian,Tahe Oilfield

作　　者：邵小明[1] 文山师[1] 刘存革[2] 罗鹏[3] 罗明霞[1] 刘永立[1] 

机构地区：[1]中国石化西北油田分公司勘探开发研究院,乌鲁木齐830011 [2]广东石油化工学院石油工程学院,广东茂名525000 [3]四川省国土勘测规划研究院,成都610045

出　　处：《地质科技情报》2017年第2期146-150,共5页Geological Science and Technology Information

基　　金：国家科技重大专项"塔里木-鄂尔多斯盆地海相碳酸盐岩层系大中型油气田形成规律与勘探评价"(2011ZX05005-004);国家重点基础研究发展计划(973计划)"中国下古生界大型油气保存条件与分布预测"(2012CB214806)

摘　　要：塔里木盆地寒武系-奥陶系碳酸盐岩受多期热液流体的影响,与热液相关的储集体发育。塔河油田下寒武统肖尔布拉克组内部存在多个异常体,由于埋藏深度大(>8 500m),缺乏实钻资料而难以确定其地质属性。三维地震资料解释、正演模型和邻区钻井资料综合分析表明,异常体上方肖尔布拉克组厚度明显变薄下凹,引起上覆寒武系垮塌,奥陶系并未受到明显影响,进而表明异常体地质属性为寒武纪末期的侵入岩体。寒武纪末期,在深部火成岩热液流体溶蚀作用下,肖尔布拉克组热液白云岩储层发育,发生了角砾化和垮塌作用,导致上覆寒武系地层表现出凹陷构造。肖尔布拉克组构造控制热液白云岩储层沿轮台断裂以大小不等的次圆状分布,而相关的淋滤滩相白云岩储层分布较广。塔河油田肖尔布拉克组成藏条件优越,具有较好的勘探前景。The Cambrian-Ordovician carbonates in Tarim Basin are affected by multi-stage hydrothermal fluids and the hydrothermal reservoir related to the fluid is well developed. There are many abnormal bodies in Lower Cambrian of the Tahe Oilfield, and it is difficult to determine its geological properties, due to the large burial depth （〉8 500 m） and the lack of real drilling data. The comprehensive analyses of 3D seismic data interpretation, forward modeling and drilling data in adjacent area reveal that the thickness of Xiaoerbulake Formation above the abnormal bodies is significantly thinner and concaved, which causes col- lapse of the overlying Cambrian strata. However, Ordovician is not affected. Thus the abnormal bodies should be intrusive mass in the end of Cambrian. In the dissolution of deep hydrothermal fluids, hydro- thermal dolomite reservoir is well developed and experiences brecciation and collapse, which leads to the depression of overlying Cambrian strata. Structurally controlled hydrothermal dolomite reservoirs in Xiao- erbulake Formation are distributed along the Luntai fault in different sizes, and the related leaching shoal facies dolomite reservoirs are widely distributed. In general, Xiaoerbulake Formation in Tahe Oilfield is of favorable reservoir forming conditions and has a good exploration prospect.

关 键 词：塔里木盆地 塔河油田 下寒武统 肖尔布拉克组 侵入岩 热液白云岩 

分 类 号：P534.41[天文地球—古生物学与地层学] P588.2[天文地球—地质学]