摘要
综合运用岩心观察、铸体薄片鉴定、扫描电镜分析、岩石物性测试以及试油结果等分析方法,对东营凹陷博兴洼陷沙四上亚段滩坝中深部储层基本特征进行了研究。结果表明:滩坝中深部储层主要为低孔低渗储层,储集空间表现为原生孔隙和次生孔隙并存发育;研究区优质储层的形成机理主要有沉积作用、地层超压、油气充注、酸性溶蚀和绿泥石颗粒包壳;坝主体和滩脊距泥岩层较远部位储层分选好,抗压实能力强,由于酸性溶解对储层的改造以及油气充注对胶结作用的抑制,中深层仍发育大量原生孔隙和次生孔隙,储层物性较好,并在异常超压和绿泥石颗粒包壳的保护下保存至今并成为有效优质储层;坝主体和滩脊距泥岩层较近部位储层,由于早期强烈的碳酸盐胶结作用并形成致密胶结壳,导致现今储层物性极差,主要发育无效储层;坝侧缘以及滩席储层原始沉积条件差,杂基含量高,在埋藏过程中以压实作用和泥质碳酸盐胶结作用为主,溶解作用微弱,现今物性差,从浅层到深层基本全为无效储层。博兴洼陷沙四上亚段滩坝优质储层主要分布在厚层坝主体和滩脊砂体的中部位置。
Based on the core observation,thin section identification,scanning electronic imaging,and petro-physical property and other technical methods,the basic reservoir characteristics of mediumdeep strata of beach-bar sandstones were investigated in the upper part of Es4（Es4s）in the Boxing sag,Dongying depression.The results indicate that the reservoirs are mainly characterized by low porosity and low permeability,and the reservoir spaces are mainly of primary and secondary pores.The formation mechanism of high-quality reservoirs is mainly consist of sedimentation,stratigraphic overpressure,hydrocarbon injection,acid dissolution,and chlorite grain coating.The reservoirs of both bar body and beach edge sub-facies that are far from mudstones are well sorted with strong anticompacting capacity.Abundant primary and secondary porosities are developed in the medium-deep strata because of the modifications caused by acid dissolution and hydrocarbon filling.These reservoirs are protected by both stratigraphic overpressure and chlorite grain coating,and therefore become effective high-quality reservoirs.The lithofacies of both bar bodies and beach edge sub-facies adjacent to mudstones are typically characterized by the extensive carbonate cementation,which results in the extremely physical properties and invalid reservoir quality.The lithofacies of both bar edge and beach mat sub-facies were deposited under the poor depositional conditions with high contents of matrix.The reservoirs were dominated by compaction and micritic carbonate cementation with weak acidic dissolution.The present physical properties are extremely poor and characterized by invalid reservoirs from shallow to deep strata.The high-quality reservoirs of beach-bar sandstones are located at the central section of thick bar bodies and beach edges.
作者
贾艳聪
操应长
林畅松
王健
Jia Yancong;Cao Yingchang;Lin Changsong;Wang Jian(School of Energy Resources, China University of Geosciences, Beijing 100083, China;School of Geosciences, China University of Petroleum（East China）, Qingdao 266580, Shandong, China;School of Ocean Sciences, China University of Geosciences, Beijing 100083, China)
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2018年第3期652-664,共13页
Journal of Jilin University：Earth Science Edition
基金
国家油气重大专项(2016ZX05006-007)
中央高校基本科研业务费专项(CUG170630)~~
关键词
优质储层
形成机理
滩坝
东营凹陷
博兴洼陷
high-quality reservoir
formation mechanism
beach-bar
Dongying depression
Boxing sag
