南堡凹陷东营组天然气成藏主控因素研究

发布时间：2019-03-01 16:38

【摘要】：为了搞清南堡凹陷东营组天然气成藏与分布的主控因素,本论文通过对南堡凹陷东营组已钻天然气井的分析,总结天然气的分布规律,认为南堡凹陷东营组天然气在平面上西部天然气富集程度明显好于东部,即南堡1号、5号和老爷庙构造天然气明显较南堡2号、3号、4号构造和高尚堡构造富集,且天然气主要分布在断裂密集带附近;垂向上,东一段天然气明显较东二、东三段富集。依据南堡凹陷已有的地质、地震、钻井资料,结合前人的研究成果对南堡凹陷东营组天然气成藏相关的源岩条件、储层条件、盖层条件及断裂输导天然气的条件进行研究,分析天然气分布与成藏条件之间的匹配关系,明确了天然气成藏的主控因素。研究结果表明南堡凹陷东营组天然气成藏的主控因素主要有:(1)气源断裂的输导能力控制天然气的分布范围,天然气主要分布在沟通I类源岩的输导断裂附近;(2)高砂地比储层和盖层的完整性控制着天然气的分布层位,天然气容易在上覆盖层断接厚度大于临界值,盖层保持较好完整性,且下伏储层砂地比值较高的层段聚集成藏;(3)断裂密集带附近的背形构造是天然气聚集的有利部位,天然气容易在背形密集带内部或边部成藏;(4)反向断裂遮挡圈闭是天然气聚集的有利类型。在明确主控因素的基础上对南堡凹陷东营组天然气有利目标进行预测及优选,提出6个预测圈闭,分别是NP1-13-N-1、NP1-13-N-2、NP4-39-S、NP2-11-N、NP2-5-E和B35x1-S圈闭,通过圈闭综合评价认为NP1-13-N-2圈闭勘探风险最小,应优先勘探。
[Abstract]:In order to understand the main controlling factors of natural gas accumulation and distribution in Dongying formation of Nanpu Sag, this paper summarizes the distribution rule of natural gas through the analysis of drilled natural gas well in Dongying formation of Nanpu Sag. It is considered that the natural gas enrichment degree of Dongying formation in Nanpu Sag is obviously better than that in the east of Nanpu No. 1, No. 5 and Laoyamiao structures, which is obviously higher than that of Nanpu structures 2, 3, 4 and Gaoshangpu tectonics. The natural gas is mainly distributed near the fault dense zone. Vertical, the east of the first section of natural gas is obviously more than the east of the second, the east of the third member enrichment. Based on the existing geological, seismic and drilling data in Nanpu Sag, combined with previous research results, this paper studies the source rock conditions, reservoir conditions, caprock conditions and the conditions of fault transportation of natural gas in Dongying formation of Nanpu Sag, based on the existing geological, seismic and drilling data, combined with previous research results, The matching relationship between the distribution of natural gas and the conditions of reservoir formation is analyzed, and the main controlling factors of gas accumulation are defined. The results show that the main controlling factors of natural gas accumulation in Dongying formation of Nanpu Sag are as follows: (1) the capacity of gas source fault controls the distribution of natural gas, and the natural gas is mainly distributed in the vicinity of the type I source rock transport fault; (2) the integrity of high sand-to-ground ratio reservoir and caprock controls the distribution layer of natural gas, the fault thickness of natural gas is more than the critical value, the caprock maintains better integrity, and the strata with high sand-ground ratio in underlying reservoir accumulate into reservoir; (3) the back-shaped structure near the fault dense zone is the favorable part of natural gas accumulation, which is easily formed in the interior or the edge of the back-shaped dense belt, and (4) the reverse fault blocking trap is the favorable type of gas accumulation. On the basis of defining the main control factors, the favorable target of Dongying formation in Nanpu Sag is predicted and optimized, and six prediction traps, namely NP1-13-N-1,NP1-13-N-2,NP4-39-S,NP2-11-N, are put forward. According to the comprehensive evaluation of NP2-5-E and B35x1-S traps, it is concluded that the exploration risk of NP1-13-N-2 traps is the least, and priority should be given to exploration.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.13

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