三塘湖盆地低阶煤煤层气成藏主控因素

doi:10.7657/XJPG20210605

摘要/Abstract

摘要：

在三塘湖盆地马朗凹陷获得了低阶煤煤层气工业气流,但该区煤层气成藏研究程度整体偏低,为进一步加深对该区煤层气富集成藏的认识,指导下一步勘探实践,根据钻探及化验分析资料,对煤层气地质特征开展了研究。结果表明,研究区煤层厚度大,煤体结构好,含气量较高,物性较好,具有较好的煤层气富集条件。综合水文地质特征及煤层气保存等条件,该区低阶煤煤层气为混合成因,雪水融化和大气降水沿盆缘斜坡进行补给,为生物气生成提供了条件,并起到对煤层气的侧向封堵作用,加之不断生成的热成因气随着构造沉降在斜坡有利位置富集成藏,确定了盆缘低阶煤煤层气混合成因模式。总之,水文地质条件、构造地质条件及顶底板封堵条件的耦合,是低阶煤煤层气富集成藏的主控因素。

关键词: 三塘湖盆地, 马朗凹陷, 低阶煤煤层气, 地质特征, 煤层气成因, 保存条件, 成藏模式, 主控因素

Abstract:

Industrial CBM (coalbed methane) flow has been obtained from the low-rank coal in the Malang sag, Santanghu basin. However, CBM accumulation there has been less researched. In order to get more understandings to guide future exploration, we studied the CBM geological characteristics through drilling and laboratory data analysis. The results show that the coal seams in the study area have large thickness, good coal structure, relatively high gas content, and good physical properties and enrichment conditions. By combining the hydrogeological characteristics with preservation conditions, it is concluded that the CBM in the low-rank coal belongs to a mixed genetic type. Water from melted snow and rain flowing along the slope of the basin margin provides good conditions for generating biogas and plays the role of a lateral seal; and at the same time, thermogenic gas generated continuously with structural subsidence accumulates in the favorable zone on the slope, which establish a mixed genetic model of CBM accumulating in the low-rank coal on the basin margin. To sum up, a good configuration of hydrogeological and structural geological conditions with top and bottom sealing abilities controls the CBM accumulation in the low-rank coal in the basin

Key words: Santanghu basin, Malang sag, CBM in low-rank coal, geological characteristic, CBM genesis, preservation condition, reservoir-forming model, controlling factor

中图分类号:

T132.2

涂志民, 王兴刚, 车延前, 张士钊, 李鹏, 曹志雄. 三塘湖盆地低阶煤煤层气成藏主控因素[J]. 新疆石油地质, 2021, 42(6): 683-689.

TU Zhimin, WANG Xinggang, CHE Yanqian, ZHANG Shizhao, LI Peng, CAO Zhixiong. Controlling Factors on CBM Accumulation in Low-Rank Coal in Santanghu Basin[J]. Xinjiang Petroleum Geology, 2021, 42(6): 683-689.

图/表 5

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