南堡凹陷中深层碎屑岩储集层成岩演化特征及成因机制  

Diagenetic evolution and formation mechanisms of middle to deep clastic reservoirs in the Nanpu sag,Bohai Bay Basin,East China

作　　者：王恩泽 刘国勇[3] 庞雄奇[1,2] 李昌荣[1,2] 吴卓雅 WANG Enze;LIU Guoyong;PANG Xiongqi;LI Changrong;WU Zhuoya(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geoscience,China University of Petroleum(Beijing),Beijing 102249,China;PetroChina Jidong Oilfield Company,Tangshan 063004,China)

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

出　　处：《石油勘探与开发》2020年第2期321-333,共13页Petroleum Exploration and Development

基　　金：国家科技重大专项“南堡凹陷油气富集规律与增储领域”(2016ZX05006-006)。

摘　　要：基于矿物学和岩石学资料,对渤海湾盆地南堡凹陷古近系沙河街组储集层性质、成岩作用特征与演化进行了分析,利用多元回归分析定量表征了优质储集层形成的主控因素,揭示了中深层优质砂岩储集层的成因机制。研究表明,南堡凹陷中深层碎屑岩优质储集层的发育主要受控于沉积微相、溶蚀作用和刚性颗粒含量,南堡凹陷不同构造带沙河街组优质储集层成因机制差异明显。南部3号构造沙河街组一段属于低孔、中高渗储集层,整体处于中成岩A2亚段,其优质储集层的形成主要得益于抗压实保孔作用,溶蚀增孔作用为辅。高尚堡构造沙河街组三段整体属于致密储集层,处于中成岩A1亚段,其致密砂岩储集层有利勘探区发育主要受控于溶蚀增孔作用。本研究为渤海湾断陷盆地深层碎屑岩储集层评价与勘探部署研究提供了借鉴,从优质储集层发育的角度认为东部地区深层碎屑岩勘探仍然具有很大潜力。The reservoir properties,diagenetic features and evolution of the Paleogene Shahejie Formation(Es)in the Nanpu sag,Bohai Bay Basin were analyzed based on mineralogical and petrological data,and the main controlling factors and formation mechanisms of medium to deep high-quality reservoir were revealed by multiple regression analysis.The results show that the sedimentary microfacies,rigid grains content,and dissolution process are the key factors controlling the formation of high-quality clastic reservoir in middle to deep depth in the Nanpu sag.The formation mechanisms of middle to deep sandstones of the Es in different structural belts differ widely in formation mechanism.The Es1(uppermost member of Es)sandstone reservoirs in the Nanpu No.3 structural belt is low porosity,moderate to high permeability reservoir in the middle diagenesis A2 stage on the whole,and the formation of high-quality reservoirs is mainly attributed to strong compaction resistance ability primarily,and dissolution process secondarily.The Es3(third member of Es)sandstones in Gaoshangpu structural belt is classified as tight sandstones in the middle diagenesis A1 stage,in which the development of favorable reservoirs is primarily controlled by dissolution.This study provides references for reservoir evaluation of deep clastic reservoirs and exploration deployment in the Bohai Bay rift basin.As there are high-quality reservoirs,it is believed that the deep clastic reservoirs in the east part of Bohai Bay Basin still have significant exploration potential.

关 键 词：中深层碎屑岩储集层 优质储集层 成岩演化 南堡凹陷 渤海湾盆地 古近系沙河街组 

分 类 号：TE122.2[石油与天然气工程—油气勘探]