苏里格气田苏76、苏77井区山西组岩相类型及沉积相

Rock facies type and sedimentary facies of Shanxi Formation in Su 76 and Su 77 Well Area, Sulige Gas Field

赵荣华¹ 田景春 2 郝海燕³ 王宏³ 范萍³ 蒙晓灵³

成都理工大学沉积地质研究院，四川 成都 610059 成都理工大学油气藏地质及开发工程国家重点实验室，四川 成都 610059 中国石油长庆油田公司，陕西 西安 710021

Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China Changqing Oilfield Company, PetroChina, Xi′an 710021, China

鄂尔多斯盆地北部苏76、苏77井区山西组为研究区主力气层。通过对控制全区的39口取心井山西组岩心的观察，将研究区早二叠世山西期岩相划分为块状基质支撑砾岩相（Gmm）、板状层理砂岩相（Sp）等 19种岩相类型。分析各种岩相及其组合类型特征，并结合测井曲线特征和区域构造、沉积背景，确定了苏76、苏77井区山西组为冲洪积扇外扇沉积环境，划分出了辫状河道、河道间洼地、洪泛平原与泥炭沼泽3种亚相和若干种微相，建立了研究区山西期沉积模式图。综合研究认为，苏76、苏77区块山西期沉积物为受阴山古陆、伊盟古隆起控制形成的杭锦旗冲积扇群不断向南延伸的产物，辫状河道砂质心滩和砾砂质心滩为主要储集砂体。该成果为研究区开发方案编制提供了地质依据。

Shanxi Formation is major gas reservoir in Su 76 and Su 77 Well Area of Sulige Gas Field. Based on the core observation and analysis of Shanxi Formation in Su 76 and Su 77 Well Area, the rock facies can be classified into 19 types, including the conglomerate facies with block matrix support and the sandstone facies with tabular cross bedding, etc. Through detailedly analyzing the combination type of rock facies, Shanxi formation in Su 76 and Su 77 Well Area are determined to be the outer fan of alluvial fan deposition combined with the characteristics of log presentation, regional structure and sedimentary background. Early Permian Shanxi Formation in the study area can be classified into braid channel, interchannel subfaces and the flood plains with peat paleo?鄄bog subfacies. Thereinto, three forms of sedimentary microfacies are divided into braid channel bar that are arenaceous channel bar, rudaceous channel bar and arenaceous conglomeratic channel bar facies. And then, the sedimentary model of Shanxi Formation in the study area is established. Comprehensive study shows that the sediments of Shanxi Formation in the study area are products of Hangjinqi alluvial fan constantly stretching to the south of Ordos basin and are dominated by Yinshan ancient land and Yimeng upwelling. The arenaceous channel bar and arenaceous conglomeratic channel bar in braid channel are the most important reservoir sand bodies in this area. This achievement can provide an important geological basis for making development program.

10.6056/dkyqt201201016