摘要
鄂尔多斯盆地胡尖山—耿湾地区延长组长6油层组主要由灰色、浅灰色中细砂岩、细砂岩与泥岩互层组成.在岩心、测井、单井相及测试资料分析的基础上,分析了研究区长6油层组的沉积微相特征及各小层沉积微相平面展布特点.结果表明:长6油层组为三角洲前缘沉积,水下分流河道、河口坝、分流间湾、远砂坝及前缘席状砂构成其主要微相,有利储集砂体为水下分流河道和河口坝砂体.长63期水下分流河道砂体之间交汇作用不强;长62期水下分流河道砂体多交叉汇合成网状;长61期不同级次的水下分流河道交叉叠合连片更加明显,砂体厚度大、分布广,为研究区长6油层组主力产层.
Chang 6 oil-bearing formation are mainly composed of gray or grayish fine sandstones and mudstone, belong to Yangchang formation in Hujianshan-Gengwan Area, Ordos Basin .According to the core describing, single-well facies and data analyzing of well and testing, as well as labor measurement, its sedimentary microfacies and the evolution and the distribution of the microfacies in every number have been studied. The result shows that front-delta is the main sedimentary system of Chang 6 in the studied area, the subaqueous distributary channel, channel-mouth bar, interdistributary ,distal bar and front sheet sandstone are the main sedimentary microfacies.The distributary channel and channel-mouth bar are the main reservoir sands. The subaqueous distributary channels are joined and converged more greatly during Chang 62 than Chang 63. Different subaqueous distributary channel sandstone is crossed and connected much more distinctly and distributed bigger extent, bigger thickenss, during Chang 61 and is the major reservoirs in the study area.
出处
《新疆地质》
CAS
CSCD
2006年第4期437-440,共4页
Xinjiang Geology
基金
四川省重点学科"构造地质学"建设基金(SZD0408)
中国石油天然气总公司重点项目联合资助
关键词
沉积微相
长6油层组
延长组
三角洲前缘亚相
Sedimentary microfacies
Chang 6 oil-bearing formation
Yangchang formation
Front-delta
