鄂尔多斯盆地东缘佳县地区太原组沉积演化及成藏条件  

Sedimentary evolution and reservoir-forming conditions of Taiyuan Formation in Jiaxian area,eastern margin of Ordos Basin

作　　者：杨晓利[1] 高娟 何福文 李金付 张明 张林科 徐文会[1] YANG Xiaoli;GAO Juan;HE Fuwen;LI Jinfu;ZHANG Ming;ZHANG Linke;XU Wenhui(Research Institute of Jidong Oilfield Company,PetroChina Co.Ltd.,Tangshan 063000,China;Changqing Branch of the Research Institute,BGP Inc.,Xi'an 710021,China)

机构地区：[1]中国石油冀东油田分公司研究院,河北唐山063000 [2]东方地球物理公司研究院长庆分院,陕西西安710021

出　　处：《天然气地球科学》2025年第1期86-96,共11页Natural Gas Geoscience

基　　金：中国石油天然气股份有限公司科技攻关项目“地震采集处理解释关键技术攻关”(编号:2021DJ3705)资助.

摘　　要：鄂尔多斯盆地东缘佳县地区下二叠统太原组具有近源成藏的优越条件,已钻井既在致密砂岩层段试获工业气流,也在灰岩层段中取得较好效果,亟需开展沉积演化及成藏条件研究,明确富集规律,落实有利区带。结合岩心、测井、地震资料,从岩性特征、沉积演化、烃源岩分布、断裂特征及储层特征等方面开展研究。结果表明:①佳县地区太原组主要为灰岩—泥岩互层、砂岩—泥岩—灰岩互层两大类型。②佳县地区太原组古地貌总体为北高南低格局,古地貌控制沉积环境、沉积环境决定沉积演化过程。③佳县地区早二叠世太原期不同时期沉积环境有着明显差别,庙沟期南部为碳酸盐岩台地灰坪相,北部为泥坪相;毛儿沟期中部为潮控三角洲相,南北两端为碳酸盐岩台地灰坪相,局部发育障壁砂坝;斜道期大部分地区为碳酸盐岩台地灰坪相,局部发育障壁砂坝;东大窑期整体进入碳酸盐岩台地灰坪相沉积。④佳县地区太原组经历4个阶段的沉积演化后,中部地区主要发育潮控三角洲水下分流河道砂岩,有利于天然气富集成藏,是勘探开发的首选目标,东南部斜道段灰岩、毛儿沟灰岩局部富集成藏,是接替勘探开发目标。⑤佳县地区太原组经过海陆交互沉积演化,为该地区天然气成藏提供了有利条件,三角洲水下分流河道砂岩中晶间孔、岩屑溶孔发育,灰岩中形成了大量的溶孔、生物孔、微裂缝等,为天然气富集成藏提供了充足的储集空间;其下部与8号煤整合接触,上部紧邻5号煤,具有先天近源成藏优势;太原组内部的致密岩层形成侧向封堵,上覆地层中多套泥岩是良好的盖层,这些条件为太原组富集成藏奠定了坚实基础,佳县地区太原组具有良好的天然气勘探开发前景。The Taiyuan Formation in Jiaxian area on the eastern edge of Ordos Basin has superior conditions for near-source reservoir formation,but the lithology combination is complex and diverse,the enrichment law is not clear,and the favorable target zone needs to be further implemented.Combined with drilling core,well log⁃ging and seismic data,the comprehensive research from lithology,sedimentary evolution,source rock distribu⁃tion,fault characteristics,reservoir characteristics and other aspects shows that:(1)The Taiyuan Formation in Jiaxian area is mainly composed of limestone type and interstratified type.(2)The paleogeomorphology of Tai⁃yuan Formation in Jiaxian area is generally high in southeast and low in northwest,and the paleogeomorphology controls the sedimentary facies belt in this area.(3)The sedimentary environment of the four submembers of Taiyuan Formation is obviously different in Jiaxian area.The southern part of Miaogou stage is carbonate plat⁃form gray flat phase,and the northern part is mud flat phase.The middle part of Maergou stage is the tide-con⁃trolled delta phase,the north and south ends are the carbonate platform gray flat phase,and local barrier sand bars are developed.Most areas of the ramp stage are carbonate platform gray flat facies and local barrier sand DAMS are developed.The whole Dongdayao stage entered the carbonate platform gray flat facies deposition.(4)The sandstone of the underwater distributional channel in the central tide-controlled delta of Jiaxian area is the preferred target of exploration and development,and the local rich and integrated reservoir of the sloping sec⁃tion limestone and Maergou limestone in the southeast is the replacement target of exploration and development.(5)The sedimentary evolution of the Taiyuan Formation in Jiaxian area provides favorable conditions for gas ac⁃cumulation in the area.Intergranular pores and debris dissolution pores are developed in the sandstone of the del⁃ta underwater distributary channel,and a large number of disso

关 键 词：鄂尔多斯盆地 太原组 灰岩 沉积相 成藏条件 

分 类 号：TE121.1[石油与天然气工程—油气勘探]