埃及阿布吉拉迪盆地下白垩统三角洲碎屑岩储层特征及控制因素——以Alam El Shawish West区块为例  

Reservoir Characteristics and Main Controlling Factors of The Lower Cretaceous Delta Clastic Rocks,Abu Gharadig Basin,Egypt:Case Study of the Alam El Shawish West Block

作　　者：田雨 赫恩杰 陈洪德[2] 卢立泽 王贺华 袁浩 张艺久 徐兵 欧阳静芸 TIAN Yu;HE En-jie;CHEN Hong-de;LU Li-ze;WANG He-hua;YUAN Hao;ZHANG Yi-jiu;XU Bing;OUYANG Jing-yun(Zhenhua Oil Holding Company Limited , Beijing 100031, China;Institute of Sedimentary Geology, Chengdu University of Technology , Chengdu 610059, China;Chengdu North Petroleum Exploration & Development Technology Co., Ltd 3, Chengdu 610000, China)

机构地区：[1]振华石油控股有限公司,北京100031 [2]成都理工大学沉积地质研究院,成都610059 [3]成都北方石油勘探开发技术有限公司,成都610000

出　　处：《科学技术与工程》2019年第11期16-25,共10页Science Technology and Engineering

基　　金：四川省国际科技合作与交流研发项目(2017HH0014)资助

摘　　要：针对埃及阿布吉拉迪盆地Alam El Shawish West(AESW)区块下白垩统Kharita组三角洲碎屑岩储层特征认识不明确,预测难度大等问题,综合利用岩心、铸体薄片、扫描电镜、X射线衍射、物性分析、地震及测井等资料,对砂岩储层特征及控制因素进行了研究。结果表明:Kharita组砂岩以石英砂岩为主,成分及结构成熟度较高。剩余原生粒间孔、次生的粒间及粒内溶孔为主要储集空间,形成以孔隙型为主的砂岩储层。储层发育及分布明显受沉积古地貌、沉积层序、沉积微相及成岩作用等多种因素控制。沉积古地貌低部位砂岩储层厚度大,分布范围广,易于形成规模型砂岩储集体。砂岩储层主要发育于水进体系域内部,厚度较大且物性较好。三角洲前缘水下分支河道及分支河口坝微相物性条件好,席状砂、支流间湾及前三角洲泥等微相较差。压实及胶结作用导致储层物性变差,溶蚀作用对储层物性具有重要的改善作用,所形成的次生粒间及粒内溶孔为重要的储集空间。Aiming at the unclear delta clastic reservoir characteristics and prediction difficulty of lower Cretaceous Kharita Formation in the Alam El Shawish West (AESW) Block, Abu Gharadiq Basin, Egypt, the reservoir characteristics and main controlling factors were studied based on core samples, casting thin sections, scanning electron microscope, X-ray diffraction, physical property analysis, seismic, and well logging data. The results show that the sandstones are dominated by quartz sandstones with high composition maturity and texture maturity. Residual primary intergranular pores, secondary intergranular and intragranular dissolved pores serve as the important reservoir spaces, thus forming the porous reservoirs. The development and distribution of reservoirs are obviously controlled by the paleotopography, sedimentary sequences, sedimentary microfacies, and diagenesis. Sandstone reservoirs are thick and continuous distributed laterally in the low palaeogeomorphic parts, where can form large-scale sandstone reservoirs. Reservoirs are mainly developed in the transgressive systems tracts with large thickness and good physical conditions. The submerged distributary channels and branched mouth bars have better physical properities, while the sheet sand, tributary bay and predelta mud microfacies are poorer. Mechanical compaction and cementation are destructive to petrophysical properties, dissolutions have important effects on reservoir improvement, the intergranular and intragranular dissolved pores serve as important reservoir spaces.

关 键 词：储层特征 控制因素 碎屑岩 三角洲相 下白垩统 阿布吉拉迪盆地 

分 类 号：P618[天文地球—矿床学]