鄂尔多斯盆地古生界煤成气勘探进展  

Progress of Paleozoic coal-derived gas exploration in Ordos Basin, West China

作　　者：杨华[1,2] 刘新社[1,2] 

机构地区：[1]中国石油长庆油田公司 [2]低渗透油气田勘探开发国家工程实验室

出　　处：《石油勘探与开发》2014年第2期129-137,共9页Petroleum Exploration and Development

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05007-004;2011ZX05044)

摘　　要：基于鄂尔多斯盆地天然气勘探实践,根据煤成气勘探现状,分析煤成气成藏控制因素,总结煤成气勘探进展。鄂尔多斯盆地已探明煤成气地质储量5.24×1012 m3,发现煤成气气田12个,主要分布于上古生界石炭-二叠系碎屑岩和下古生界奥陶系碳酸盐岩储集层中。上古生界形成致密砂岩气藏,广覆式生烃的煤系烃源岩和大面积分布的砂岩储集层相互叠置,储集层先致密后成藏,天然气近距离运移、大面积成藏,发现了苏里格气田,探明地质储量3.49×1012m3,落实了盆地东部和陇东地区两大储量接替区。下古生界形成海相碳酸盐岩气藏,上覆煤系烃源岩生成的天然气向下运移聚集成藏,奥陶系风化壳岩溶和白云岩储集层为天然气富集主要场所,发现了靖边气田,探明地质储量7 000×108 m3,同时发现多个含气富集区。Based on practices of gas exploration in the Ordos Basin, this paper analyzes the controlling factors of large-scale accumulation conditions and distribution characteristics of coal-derived gas, and concludes the exploration progress of coal-derived gas according to the present exploration situations. There are 5.24×10^12m^3 proven coal-derived gas reserves in the Ordos Basin. Twelve coal-derived gas fields have been found, mainly distributed in the Upper Paleozoic Carboniferous-Permian clastic rocks and Lower Paleozoic Ordovician marine carbonate reservoirs. Tight sandstone gas reservoirs are developed in the Upper Paleozoic. The widely covered hydrocarbon source of coal stacks each other with large-scale sandstone reservoirs, the reservoirs tightened firstly and natural gas accumulated later, and natural gas migrated shortly and accumulated in a large area. The Sulige large gas field has been found with proven coal-derived gas reserves of 3.49×10^12m^3, and two large-scale reserve replacements have been determined in the eastern part of the basin and the Longdong area. Marine carbonate gas pools are developed in the Lower Paleozoic. The gas generated from the overlying coal source rocks migrated downward and accumulated in the Ordovician weathering crust karst and dolomite reservoirs. The Jingbian gas field has been found with proven coal-derived gas reserves of 7 000×10^8m^3, meanwhile, several gas-rich regions have also been found.

关 键 词：鄂尔多斯盆地 古生界 煤成气 致密气 碳酸盐岩气藏 成藏条件 勘探进展 

分 类 号：TE122[石油与天然气工程—油气勘探]