靖边气田北部中奥陶统马家沟组五_4~1储层沉积微相组合与储层非均质性控制因素  

Sedimentary Microfacies Assemblages and Heterogeneity Controlling of Middle Ordovician Majiagou 5_4~1 Submember Reservoir in the North Part of Jingbian Gas Field,Ordos Basin

作　　者：万梨[1] 侯明才[2] 陈洪德[2] 

机构地区：[1]中国石化勘探南方分公司研究院 [2]成都理工大学油气藏地质及开发工程国家重点实验室

出　　处：《海相油气地质》2012年第4期39-48,共10页Marine Origin Petroleum Geology

摘　　要：中奥陶统马家沟组上部马五41储层是鄂尔多斯盆地靖边气田主力产气段,根据该层段的岩石学特征和沉积构造等,可划分为3个亚相以及9个微相组合。该储层的储集性能具有强烈的非均质性,微观上表现为低孔低渗,以微细喉、细喉为主;纵向上表现为反韵律、随机韵律、均质韵律3种韵律模式,平面上表现为平均岩心孔隙度、渗透率分布的非均一性。沉积微相及微相组合差异性是控制岩石孔隙发育的基础,成岩作用决定了孔隙发育的程度,古岩溶地貌类型对储层分布有着明显制约作用,最终导致该区储集性能在纵横向上的非均质性。Middle Ordovician Majiagou 541 Submember is one of the main nature gas pay horizons in Jingbian Gas Field,Ordos Basin.3 subfacies and 8 microfacies assemblages have been recognizes according to the petrologic characteristics and Sedimentary Structures.By analysis of physical data,it is considered that the structures and properties of the reservoir rock show intensive heterogeneity.Microcosmically,it mainly shows microfine throats and fine throats with low porosity and low permeability.Longitudinally,it shows abnormal rhythm,random rhythm and homogeneous rhythm modes.Horizontally,it shows nonuniformity in average porosity and permeability presented in lateral development.The difference of sedimentary microfacies and microfacies assemblages is the basis for controlling rock pore development.Diagenesis determines the extent of pore development.Karst palaeo-landform styles obviously restrains to the reservoir distribution.All of these common processes eventually lead to the lateral heterogeneity in reservoirs.

关 键 词：靖边气田 马家沟组 岩溶型储集层 储集层特征 沉积相 成岩作用 

分 类 号：TE112.23[石油与天然气工程—油气勘探]