鄂尔多斯盆地志靖-安塞地区长2油藏成藏主控因素分析  

Hydrocarbon Accumulation Main-Controlling Factor Analysis of Chang2 Reservoir in Zhijing-Ansai of Ordos Basin

作　　者：冯顺彦[1,2] 张晓辉[1,2] 李成 井向辉[1,2] 孙磊[3] Feng Shunyan;Zhang Xiaohui;Li Cheng;Jing Xianghui;Sun Lei(PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710018,China;State Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi’an,Shaanxi 710018,China;CNPC Greatwall Drilling Company,Panjin,Liaoning 124010,China)

机构地区：[1]中国石油长庆油田分公司,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [3]中国石油长城钻探工程有限公司,辽宁盘锦124010

出　　处：《特种油气藏》2020年第4期54-59,共6页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“鄂尔多斯盆地致密油资源潜力、‘甜点’预测与关键技术应用”(2016ZX05046-005);中国石油重大科技专项“长庆油田5000万吨持续高效稳产关键技术研究与应用”子课题“鄂尔多斯盆地超低渗透致密油藏有效开发技术研究”(2016E-0505)。

摘　　要：针对志靖-安塞地区长2油藏地质条件复杂,油气富集的主控因素不明确的问题,通过烃源岩、沉积相、优势砂体、运移通道、盖层及圈闭条件等综合研究,对长2油层组沉积相、砂体分布规律、有利圈闭进行综合分析。结果表明:长2油藏石油富集成藏受油源、不整合、低幅构造、沉积相及储层特征、盖层等多种因素的控制和影响;该区中部紧邻生烃中心,为成藏提供油源保障;延长组叠置储渗砂体是长7烃源岩排除油气运移至长2的主要通道,不整合面和裂缝是运移通道的有效补充;分流河道交汇处高渗砂体与近东西向排状鼻隆的匹配是石油聚集的有利场所,盖层与纵向砂体结构决定了石油主要富集在长2Ⅰ3小层。长2油藏在多因素的共同控制下,发育岩性、构造-岩性、弱构造-岩性等3种油藏类型,研究成果指明了长2油藏下步勘探方向。In order to understanding the complex geology of Chang 2 oil reservoir in Zhijing-Ansai and determine the main-controlling factors of hydrocarbon enrichment,the sedimentary facies,sandbody distribution patterns,favorable traps and other hydrocarbon enrichment mechanisms were comprehensively analyzed by the researches on source-rock,sedimentary facies,favorable sandbodies,migration channels,trap conditions,etc.Result indicates that the hydrocarbon enrichment in Chang 2 oil reservoir are dependent on multiple factors,including hydrocarbon source,unconformity,low-amplitude structure,sedimentary facies,reservoir properties,caprock properties,etc.The matching between the high-permeability sandbodies at the junction of distributary channels and the near-east row nose-shaped uplift is favorable to hydrocarbon accumulation.The caprock and longitudinal sandbody structures result in the hydrocarbon enrichment in Chang 2Ⅰ3 sub-layer.There are lithology,structure-lithology and weak structure-lithology reservoir categories in Chang 2 oil reservoir due to multiple controlling factors.This research could provide certain guidance for the further exploration in Chang 2 oil reservoir.

关 键 词：鄂尔多斯盆地 志靖-安塞地区 长2油藏 成藏主控因素 油藏类型 

分 类 号：TE121.1[石油与天然气工程—油气勘探]