摘要
综合岩心、薄片、成像测井等资料,在高精度层序地层划分及沉积相研究的基础上,对四川盆地磨溪地区震旦系灯影组四段的台缘丘、台缘丘后滩及局限台地等相带储层特征进行了描述和对比。研究结果表明:(1)磨溪地区灯影组四段可划分出2个三级层序、7个准层序组和13个准层序。(2)研究区台地边缘带可划分出台缘丘、台缘滩、丘(滩)间等亚相,在局限台地内部识别出了台内丘、台内滩、丘(滩)间、潟湖和局限潮下等亚相,并细分了微相类型。(3)台缘区与台内区的储集岩石类型、储集空间及储集类型等基本一致,受三级层序高位体系域控制,垂向上发育2套储层,低角度和高角度微裂缝密度垂向上差异较大,物性具有向上变好的趋势。(4)不同相带储层孔隙空间类型及储层物性存在差异,台缘微生物丘发育区储层物性好,微裂缝和孔洞发育好,台缘丘后滩发育区微裂缝和孔隙发育程度及储层物性均变差,台内区进一步变差,但远离台缘区的局限台地区仍发育良好储层。
Based on the high-precision sequence stratigraphic division and sedimentary facies research,the reservoir characteristics of the platform-margin mound,the back shoal of platform-margin mound and the restricted platform of the fourth member of Sinian Dengying Formation in Moxi area,Sichuan Basin were characterized and compared by using the data of cores,thin sections and imaging logging.The results show that:(1)The fourth member of Dengying Formation in Moxi area can be divided into two third-order sequences,seven parasequence sets and 13 parasequence.(2)Platform-margin mound,platform-margin shoal,inter-mound and shoal were recognized in platform-margin,and restricted platform were divided into inner mound,inner shoal,inter mound,lagoons and restricted subtidal subfacies,then the microfacies were divided further.(3)The reservoir rock type,reservoir space and reservoir type of platform-margin zone and intra-platform area are basically the same and controlled by the highstand systems tract.Two sets of reservoirs are developed vertically,low angle and high angle microfractures are differently developed vertically,and physical properties tend to improve upward.(4)The reservoir space types and physical properties in different facies zones are different.The platform-margin microbial mound has the characteristics of good reservoir physical properties,with microfractures and pores well developed.The development degree of microfractures and pores and physical properties in the development area of back shoal of platform-margin mound is weakened,and it is further weakened in the intra-platform zones.However,there are good reservoirs developed in the restricted platform far from the platform-margin zones.
作者
耿夏童
邢凤存
闫海军
付辉
柴寒冰
刘志波
陈孝全
古强
GENG Xiatong;XING Fengcun;YAN Haijun;FU Hui;CHAI Hanbing;LIU Zhibo;CHEN Xiaoquan;GU Qiang(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Chengdu North Petroleum Exploration and Development Technology Co.,Ltd.,Chengdu 610051,China)
出处
《岩性油气藏》
CAS
CSCD
北大核心
2022年第6期126-140,共15页
Lithologic Reservoirs
基金
国家自然科学基金项目“川北江油-剑阁地区早三叠世近源重力流滑塌砾石早期白云石化记录及其地质意义”(编号:41672103)
国家自然科学基金项目“川东北早三叠世飞仙关期同期多排碳酸盐岩台缘带不对称沉积结构及成因”(编号:41302089)联合资助。
关键词
微生物丘
台缘丘
局限台地
表生岩溶
灯影组四段
震旦系
磨溪地区
四川盆地
microbial mound
platform-margin mound
restricted platform
supergene karst
the fourth member of Dengying Formation
Sinian
Moxi area
Sichuan Basin
