南堡凹陷东北部东二段重力流砂岩储层发育规律  

Development law of gravity flow sandstone reservoir in the second Member of the Dongying Formation in the northeastern Nanpu Depression

作　　者：李聪[1] 鲜本忠[2,3] 王鹏宇 陈蕾[1] 田荣恒 杨荣超 陈思芮 Li Cong;Xian Benzhong;Wang Pengyu;Chen Lei;Tian Rongheng;Yang Rongchao;Chen Sirui(Jidong Oilfield Company,PetroChina,Tangshan Hebei 063004,China;State Key Laboratory of Petroleum Resources and Prospecting,Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油冀东油田公司,河北唐山063004 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油大学(北京)地球科学学院,北京102249

出　　处：《地质科技通报》2023年第2期159-169,共11页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(41872113,42172109,42172108);中国石油天然气集团有限公司:中国石油大学(北京)战略合作科技专项(ZLZX2020-02);国家重点研发计划项目(2018YFA0702405);中国石油大学(北京)科研启动基金项目(2462020BJRC002,2462020YXZZ020)。

摘　　要：随着勘探程度的提高,深水重力流成因的浊积岩储层已成为我国东部断陷湖盆油气勘探开发的重要目标之一。因为沉积分异不足和成岩破坏,重力流砂岩的储层质量通常整体较差,优质储层的预测成为制约其有效油气勘探的关键地质因素。利用岩心、测井资料及储层物性、岩石薄片分析结果,研究了南堡凹陷东北部东营组二段重力流砂岩的岩相特征、成因类型、储层特征,以探索优质储层的控制因素和发育规律。研究表明,区内重力流沉积可细分为8种岩相,解释为滑动滑塌、砂质碎屑流、泥质碎屑流、浊流4类成因。储层物性参数统计分析证实,本区重力流砂岩储层非均质性强,储层质量受控于砂岩成因、砂-泥结构及其影响的溶蚀强度。从成因看,砂质碎屑流和浊流对重力流砂岩优质储层的发育贡献最大。砂质碎屑流成因的块状砂岩厚度较大、泥岩夹层较少、钙质胶结物的溶蚀程度高,储层质量最好;而浊流成因的砂岩厚度较薄,与泥岩呈互层或夹层产出,成岩环境封闭、钙质胶结物溶蚀程度低,储层质量较差。本研究为湖盆深水重力流砂岩油气的高效勘探开发提供了一种基于成因和结构的储层预测思路。With the improvement of hydrocarbon exploration,turbidite reservoirs formed by deep-water gravity flow have become an important target for oil and gas exploration and development in faulted basins in eastern China.Due to the weak depositional differentiation and diagenesis damage,the overall quality of gravity flow sandstone reservoirs is poor.The prediction of high-quality reservoirs is becoming the key to restricting effective hydrocarbon exploration.In this paper,the authors study the distribution,lithofacies,and reservoir characteristics of gravity flow sandstone in the northeastern Nanpu Depression by cores,well-logging data,reservoir physical properties,and rock slices to explore the key control factor and development law of high-quality reservoirs.The result shows that the gravity flow sediments are mainly composed of eight lithofacies interpreted as slide-slump,sandy debris flow,muddy debris flow,and turbidity current.According to the statistical analyses of reservoir physical property parameters,it is proven that the gravity flow sandstone reservoir is with strong heterogeneity and that its quality depends on sandstone genesis,sand-mud structure,and dissolution intensity.The high-quality reservoirs are mainly from sandy debris flows and turbidity currents.Massive sandstones from sandy debris flows are usually high-quality reservoirs characterized by large single-bed thickness,strong calcareous dissolution of calcareous cement,and few muddy interbeds.In contrast,the sandstones from turbidity currents are of low quality due to small thickness,weak dissolution of calcareous cement,and many interbedded mudstones,and are formed in a closed diagenetic environment.This study provides an effective predictive idea for hydrocarbon exploration on deep-water gravity flow sandstone reservoir in a lacustrine basin based on analyses of sandstone genesis and sand-mud structure.

关 键 词：沉积物重力流 砂岩储层 碎屑流 浊流 砂-泥组合 

分 类 号：P588.2[天文地球—岩石学]