惠民凹陷临7断块区沙三段沉积相分析  

Study on sedimentary facies of the third member of Shahejie Formation in Lin 7 fault block, Huimin Sag

作　　者：罗薇[1] 何幼斌[2] 马波[3] 

机构地区：[1]中国石化华东分公司石油勘探开发研究院,南京210011 [2]长江大学地球科学学院,武汉430100 [3]中国石化华东分公司非常规油气资源勘探开发指挥部,南京210011

出　　处：《岩性油气藏》2014年第6期57-63,共7页Lithologic Reservoirs

摘　　要：针对研究区沉积相认识不清等问题,在岩心观察的基础上,利用区域地质、分析化验和测井等资料系统研究了惠民凹陷临7断块区沙三段沉积相,认为研究区发育三角洲相、浊积扇相、湖泊相,其中三角洲相包括水下分支河道、支流间湾、分支河口砂坝、远砂坝及前三角洲泥等5种微相,浊积扇相包括沟道、沟道间、沟道前缘、沟道侧缘及外扇泥等5种微相,湖泊相主要发育半深湖—深湖泥微相。平面上,三角洲、沟道沉积均沿北西—南东向展布;垂向上,沙三下亚段发育三角洲沉积,沙三中、上亚段发育浊积扇、半深湖—深湖沉积。从沙三下到沙三上沉积期,砂体反复进积、退积,并逐渐由西向东移动,研究区水体虽也有短暂下降,但总体呈上升趋势。开展临7断块区沙三段沉积微相分析,为储层综合研究提供了地质依据。Based on core observation, combining with data of regional geology, analysis assay and well logging, this paper systematically studied the sedimentary facies of the third member of Shahejie Formation （E s3） in Lin 7 fault block of Huimin Sag. It is considered that the study area developed delta, turbidite fan and lacustrine facies. The delta can be further divided into mierofacies of underwater distributary channel, interdistributay bay, mouth bar, distal bar and prodelta mud, the turbidite fan can be further divided into microfacies of channel, interchannel, lateral frontehannel, margin channel and outer fan mud, and the lacustrine facies mainly developed semi-deep to deep lake mud. In the plan, the sediment in Es3 spreaded along WN-ES direction. In vertical profile, the delta deposite mainly developed in lower Es3, the turbidite fan and the semi-deep to deep lacustrine mainly developed in middle and upper Es3. From lower Es3 to upper Es3, sand body experienced progradation to retrogradation repeatedly, and moved from west to east gradually, and the water is deepening gradually on the whole, including some short decreasing. This study of sedimentary microfacies provides geological basis for the comprehensive reservoir research of E s3 in Lin 7 fault block.

关 键 词：沉积相 三角洲 浊积扇 沙三段 惠民凹陷 

分 类 号：TE121.3[石油与天然气工程—油气勘探]