鄂尔多斯盆地中部马5_(1+2)亚段碳酸盐岩丘滩体沉积相及储层研究  

Study on Sedimentary Facies and Reservoirs of Carbonate Mound and Shoal of Ma 5_(1+2)Member in the Center of Ordos Basin

作　　者：徐欣 薛纯琦 黄荣宾 XU Xin;XUE Chunqi;HUANG Rongbin(Shaanxi College of Communications Technology,Xi′an710018,China;Oil and Gas Technology Research Institute,PetroChina Changqing Oilfield Company,Xi′an 710018,China)

机构地区：[1]陕西交通职业技术学院,陕西西安710018 [2]长庆油田分公司油气工艺研究院,陕西西安710018

出　　处：《河北地质大学学报》2025年第1期63-68,共6页Journal of Hebei Geo University

基　　金：陕西省教育厅科学研究计划项目(23JK0336)。

摘　　要：马家沟组碳酸盐岩蕴藏巨大的油气资源。通过岩心观察、薄片、扫描电镜鉴定、阴极发光分析,对马5_(1+2)亚段沉积微相进行划分,分析沉积微相类型,并对储层进行研究。结果表明:1)马5_(1+2)亚段主要发育石膏晶模孔泥粉晶云岩、颗粒云岩、微晶云岩、微生物岩;2)马家沟组为局限-蒸发台地沉积,可以分为颗粒滩、微生物丘、台坪和潟湖4个亚相,其中,颗粒滩亚相可以分为滩间海、滩翼、滩核微相,微生物丘亚相可以分为丘基、丘核和丘盖微相;3)研究区孔隙类型主要为膏模孔、粒间孔、溶孔、晶间孔和裂缝;4)颗粒岩和微生物岩的形成受海平面变化及古地貌的影响。The Majiagou Formation carbonate rocks have rich oil and gas resources.This article divides the sedimentary microfacies of the Ma 5_(1+2) submember through core,thin sections,scanning electron microscopy experiments,analyzes the sedimentary microfacies types and the reservoir.The results show that:1)The Ma 5_(1+2) submember mainly develops fine crystalline dolomite with gypsum mould pores,granular dolomite,crystalline dolomite and microbial rocks.2)The Majiagou Formation is restricted evaporative platform,which can be divided into four subfacies:shoal,microbial mound,platform flat and lagoon.The shoal can be divided into intershoal sea,shoal flank,and shoal body microfacies.Microbial mound subfacies can be divided into mound base,mound body,and mound cap microfacies.3)The main types of pores are gypsum mould pores,intergranular pores,dissolved pores,intergranular pores and fractures.4)The formation of shoal and mound is influenced by changes of sea level and ancient landforms.

关 键 词：碳酸盐岩 马家沟组 丘滩体 主控因素 

分 类 号：P54[天文地球—构造地质学]