大港探区港北潜山中生界碎屑岩储层特征及发育主控因素  

Reservoirs characteristics and main development controlling factors of Mesozoic clastic rocks in Gangbei buried hill of Dagang exploration area

作　　者：李祖兵 李剑 崔俊峰 杨萍 邢立平[3] 吴雪松[3] LI Zubing;LI Jian;CUI Junfeng;YANG Ping;XING Liping;WU Xuesong(Chongqing Key Laboratory of Complex Oil and Gas Field Exploration and Development,Chongqing 401331,China;Langfang Branch of PetroChina Research Institute of Petroleum Exploration&Development,Langfang 065000,China;Exploration&Development Research Institute of PetroChina Dagang Oilfield Company,Tianjin 300280,China)

机构地区：[1]复杂油气田勘探开发重庆市重点实验室,重庆401331 [2]中国石油天然气股份有限公司勘探开发研究院廊坊分院,河北廊坊065000 [3]中国石油大港油田勘探开发研究院,天津300280

出　　处：《大庆石油地质与开发》2020年第2期9-20,共12页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司科技创新基金项目“深部优质火山岩储层成因机理研究”(2013D-5006-0104)。

摘　　要：大港探区港北潜山中生界储层成因演化复杂、储层空间分布非均质性强。为了探究储层发育控制因素,利用岩心、岩石薄片、X射线全岩衍射、压汞、铸体薄片及扫面电镜等实验分析测试资料,系统地分析了储层的岩石学、成岩作用、储集空间等特征。研究表明:中生界碎屑岩以长石砂岩和岩屑质砂岩为主,主要发生了压实、胶结、交代和溶蚀等成岩作用;碎屑岩储层次生孔隙发育,占比74.65%,原生孔隙及裂缝占比较小,总体上为低孔低渗储层,局部存在高孔高渗储层;埋深、异常压力和溶蚀作用是储层发育主控因素,浅埋藏阶段主要发生压实、胶结作用,后期快速埋藏作用阶段主要发生溶蚀作用,机械压实作用与粒间溶蚀作用造成原生孔隙损失32%~90%,异常压力段储层物性好于非异常压力段,溶蚀作用是次生储集空间发育的主要作用类型;储层有利区主要分布在板桥次凹与歧口主凹的南部。Mesozoic reservoirs are characterized by the complex genesis and evolution and strong heterogeneity of the spatial distribution of the reservoirs in Gangbei buried hill of Dagang exploration area.In order to explore the controlling factors of the reservoir development,with the help of the core,rock thin section,X-ray whole-rock diffraction,mercury injection,cast slice,scanning electron microscope and the other experimental analyzing and testing data,the characteristics of the reservoir petrology,diagenesis,accumulating space and so forth were systematically analyzed.The studies show that Mesozoic clastic rocks are dominated by the feldspathic sandstones and lithic sandstones,the diageneses such as compaction,cementation,metasomatism,dissolution and so on were engaged;the secondary pore of the clastic reservoirs are developed and its proportion is up to 74.65%,the primary pores and cracks are rather small.The reservoirs are generally characterized by low-porosity and low-permeability reservoirs,but the partial exits high-porosity and high-permeability reservoirs;the reservoir development is mainly controlled by the buried depth,abnormal pressure and dissolution,the compaction and cementation occur mainly in the shallow burial stage,while the dissolution is principally dominant in the late fast burial stage,the loss rates of the primary pore caused by the mechanical compaction and intergranular erosion are from 32%to 90%,the reservoir physical properties in the abnormal pressure section are better than those in the non-abnormal pressure interval,the dissolution is the main acting type of the secondary accumulating space development;the favorable blocks of the reservoirs are mainly distributed in the southern parts of Banqiao Subsag and Qikou Sag.

关 键 词：港北潜山 中生界 储层特征 溶蚀作用 控制因素 

分 类 号：TE122.2[石油与天然气工程—油气勘探]