内蒙古杭锦旗探区石炭——二叠系天然气成藏模式

发布时间：2018-12-27 12:33

【摘要】：鄂尔多斯盆地北部杭锦旗探区泊尔江海子—三眼井断裂带南北两侧石炭—二叠系的烃源岩、储集层、源储关系、气水分布、油气运移及产能等成藏条件与特征都具有明显的区别。通过分析断裂带南、北天然气甲烷含量和密度特征的差异,认为断裂带以北天然气部分来自于南部。划分了3种不整合面运移通道类型,并通过分析断层特征,明确了南部生成的天然气可以通过不整合面和断层运移至断裂带以北。结合生储盖组合、运移输导等特征,确定了断裂带以南的伊陕斜坡区煤系气源岩与河流相致密砂岩储层的成藏组合特点为源储紧邻、广覆式分布,断裂带以北的继承性隆起区,虽本地气源条件较差,但与断裂带以南的源岩区构成侧接式组合。探区位于鄂尔多斯盆地北部石炭—二叠系准连续—非连续成藏过渡带上,依此建立了"源储紧邻、物性控藏"和"双源供气、圈闭控藏"南北两种不同的天然气成藏模式。
[Abstract]:Carboniferous-Permian hydrocarbon source rocks, reservoirs, source-storage relationships, gas and water distribution in the north and south sides of the Boerjianghaizi-Sanyan fault zone in the northern part of the Ordos Basin, Hangjinqi exploration area, The reservoir forming conditions and characteristics of oil and gas migration and productivity are obviously different. By analyzing the difference of methane content and density in the south and north of the fault zone, it is concluded that the natural gas in the north of the fault zone comes from the south. Through the analysis of fault characteristics, it is clear that the gas generated in the south can be transported to the north of the fault zone by unconformity surface and fault. Combined with the characteristics of source reservoir and caprock assemblage and migration and transportation, it is determined that the gas source rocks of coal measures and fluvial tight sandstone reservoirs in the Yishan slope area south of the fault zone are characterized by close proximity of source reservoir, wide overlying distribution, and inherited uplift area north of the fault zone. Although the local gas source conditions are poor, it forms a lateral association with the source rock area south of the fault zone. The exploration area is located on the transitional zone of Carboniferous-Permian quasi-continuous-discontinuous reservoir formation in the northern part of Ordos Basin. Based on this, two different natural gas accumulation models, namely "source storage close proximity, physical control reservoir" and "dual source gas supply, trap control reservoir", have been established.
【作者单位】：长江大学地球科学学院;中石化华北石油工程有限公司测井分公司;中国石化华北油气分公司勘探开发研究院;中国地质大学(武汉)地球物理与空间技术学院;中国石油东方地球物理公司研究院;
【基金】：中国石油化工股份有限公司科技项目“杭锦旗地区大中型气田形成条件与分布规律”(P13109)
【分类号】：P618.13

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