鄂尔多斯盆地北缘勘探思路转变与天然气领域重大突破

doi:10.3969/j.issn.1672-7703.2020.06.004

摘要/Abstract

摘要： 鄂尔多斯盆地北缘构造转换带发现的东胜气田为近中期中国天然气重要的增储上产阵地之一。“十三五” 以来，通过持续深化鄂尔多斯盆地构造、沉积演化特征研究，明确其对烃源岩、储层、输导条件的控制作用，加强盆地区域构造及成藏要素差异配置分析，实现了认识创新和勘探思路转变，明确不同区带差异富集规律，有效指导了盆地北缘致密砂岩气藏勘探突破。研究认为，鄂尔多斯盆地北缘有效烃源岩、储层及侧向输导通道的差异匹配是天然气差异富集的主控因素；处于杭锦旗区块中部的独贵加汗区带继承性古隆起斜坡区下石盒子组具有“源储有效配置、上倾尖灭封堵”的有利天然气富集条件，多期断裂活动为多层气藏形成提供了有效输导通道；独贵加汗区带是勘探开发一体化评价及新层系勘探突破的首选区带。近期该区带提交探明储量超千亿立方米，有效推动开发建产，提升了盆缘天然气资源价值，拓展了勘探领域。

关键词: 鄂尔多斯盆地北缘, 富集规律, 差异配置, 勘探思路, 重大突破

Abstract: The Dongsheng gas field, discovered in a tectonic transform zone in the northern margin of the Ordos Basin, is an important base for gas reserves and production increase in China in the near and medium term. Since the “13th Five Year Plan” period, understanding of the structural and sedimentary evolution characteristics of the Ordos Basin has been continuously deepened and the factors controlling source rocks, reservoirs, and migration conditions have been defined. Analysis has focused on regional structures and the differential configurations of hydrocarbon accumulation factors in the basin with the objective of developing new understandings and transforming exploration ideas. The enrichment laws of the various plays have been determined, effectively supporting an exploration breakthrough in the tight sandstones in the northern margin of the basin. This study shows that differential configuration of effective source rocks, reservoirs, and lateral transport channels is the main controlling factor for differential gas enrichment in the northern margin of the Ordos Basin. A successively developed paleo-uplift slope zone in the Duguijiahan gas play in the central Hangjinqi block has favorable gas accumulation conditions in the Lower Shihezi Formation, which can be described as “effective configuration of source rocks and reservoirs and sealing by up-dip pinch out”. Multi-stage fault activity provided effective transport channels for the formation of multi-layer gas reservoirs. The Duguijiahan play is the first choice for integrated evaluation for petroleum exploration and development and the exploration breakthrough in new strata. Recently, more than 100 billion cubic meters of proven gas reserves have been submitted in this area, effectively promoting development and productivity construction, improving the value of natural gas resources, and expanding the exploration area in the margin of the basin.

中图分类号:

何发岐, 王付斌, 张威, 安川, 齐荣, 马超, 陈英毅, 李春堂, 范玲玲, 归平军. 鄂尔多斯盆地北缘勘探思路转变与天然气领域重大突破[J]. 中国石油勘探, 2020, 25(6): 39-49.

He Faqi, Wang Fubin, Zhang Wei, An Chuan, Qi Rong, Ma Chao, Chen Yingyi, Li Chuntang, Fan Lingling, Gui Pingjun. Transformation of exploration ideas and a major breakthrough in natural gas exploration in the northern margin of the Ordos Basin[J]. China Petroleum Exploration, 2020, 25(6): 39-49.

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