南堡凹陷深层储层成岩作用与孔隙演化——以3号构造带古近系沙一段为例  

Diagenesis and Porosity Evolution of Deep Reservoirs in the Nanpu Sag: A case study of Sha 1 Member of the Paleogene in No. 3 structural belt

作　　者：杨佳奇 纪友亮[1] 吴浩 孟令箭[4] YANG JiaQi;JI YouLiang;WU Hao;MENG LingJian(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Mineral Resources in Western China(Gansu Province),School of Earth Sciences,Lanzhou University,Lanzhou 730000,China;Research Institute for Exploration and Development,PetroChina Jidong Oilfield Company,Tangshan,Hebei 063004,China)

机构地区：[1]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 [2]中国地质大学(北京)能源学院,北京100083 [3]兰州大学地质科学与矿产资源学院,甘肃省西部矿产资源重点实验室,兰州730000 [4]中国石油冀东油田勘探开发研究院,河北唐山063004

出　　处：《沉积学报》2022年第1期203-216,共14页Acta Sedimentologica Sinica

基　　金：国家自然科学基金(41272157,41672098);国家科技重大专项(2016ZX05006-006)~~。

摘　　要：基于储层沉积学、岩石学理论基础及铸体薄片、扫描电镜、X射线衍射、孔渗等分析资料,对渤海湾盆地南堡凹陷3号构造带沙河街组一段(沙一段)储层特征与成岩作用进行详细系统地研究,明确了各成岩作用强度,重建了研究区深层储层成岩演化序列,并定量分析了各成岩作用对于储层孔隙度的影响。结果表明:沙一段储层沉积相带为辫状河三角洲前缘,目前处于中成岩阶段A2期,平均孔隙度为12.4%,平均渗透率为92.3×10^(-3)μm^(2),先后经历了压实、早期胶结、溶蚀以及晚期胶结作用,其中压实作用是最主要的减孔作用,压实造成孔隙度损失约17%,溶解作用一定程度上改善了储层物性,溶蚀增加孔隙度约7.6%。预测了深层储层孔隙演化路径和储层质量,并最终建立孔隙度演化模式,为后续勘探开发提供了借鉴。Sedimentary and petrological analysis,thin section observation and other data were selected to systematically depict the physical and diagenetic features of the first member of the Shahejie Formation(Es1)in the No. 3 structural belt of the Nanpu Sag,Bohai Bay Basin. The intensities of different diagenetic processes are revealed,the diagenetic evolution sequence is reconstructed,and the effects of different diageneses on the reservoir are quantitatively analyzed. The results show that the sedimentary environment of the Es1 Formation was a braided river delta front,which is currently in the mesodiagenesis A2 stage. The average porosity and permeability are 12.4% and 92.3×10–3μm2,respectively. The reservoir has successively experienced compaction,early cementation,dissolution and late cementation. Compaction was the main diagenetic process for porosity reduction,accounting for about 17% loss of porosity. The dissolution process clearly improved the porosity,causing 7.6% porosity increase. The porosity evolution path and quality of deep reservoir are predicted,and ultimately establish the porosity evolution model,providing a reliable reference for subsequent petroleum exploration and development.

关 键 词：成岩作用 成岩演化 孔隙度定量计算 南堡凹陷 

分 类 号：P618.13[天文地球—矿床学]