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马达班湾盆地东部上新统砂体比较发育,且紧邻生气凹陷,具有油气成藏的优越条件。文章对马达班湾盆地东部上新统岩性气藏的油气成藏条件进行了综合分析,建立了研究区斜坡带与凹陷带岩性气藏的成藏模式。研究认为,研究区新构造运动为该区岩性气藏的形成提供了良好的地质背景,优越的区域位置和良好的烃源岩为该区岩性气藏的形成与富集奠定了基础,沉积体系的时空分布控制了岩性圈闭的发育与分布,具有良好的储盖组合与保存条件,骨架砂体与断层等为油气提供了良好的运移通道。结合国内外岩性气藏的研究现状,该区岩性气藏可划分为砂岩上倾尖灭气藏、断层-岩性气藏2种,且以断层-岩性气藏为主。研究区斜坡带下部与凹陷带的成藏条件优越,为岩性气藏的有利发育带。
The Upper Pleistocene sand body in the eastern part of the Madanswan Basin is well developed and closely adjacent to the gas sag. It has the favorable conditions for hydrocarbon accumulation. In this paper, the hydrocarbon accumulation conditions of the Upper Pleistocene lithologic gas reservoirs in the eastern part of the Madanshan Basin are comprehensively analyzed, and the hydrocarbon accumulation modes of lithologic gas reservoirs in the slope zone and depression zone in the study area are established. The study suggests that the Neotectonic movement in the study area provided a good geological background for the formation of lithologic gas reservoirs in this area. The superior regional location and good source rocks have laid the foundation for the formation and enrichment of lithologic gas reservoirs in this area, The spatial and temporal distribution of sedimentary systems controls the development and distribution of lithologic traps, and has good reservoir-cap assemblage and preservation conditions. The framework sand bodies and faults provide good migration channels for oil and gas. Combined with the research status of lithologic gas reservoirs at home and abroad, the lithologic gas reservoirs in this area can be divided into two types of gas-tight gas reservoirs, fault-lithologic gas reservoirs, and fault-lithologic gas reservoirs. The forming conditions of the lower part of the slope zone and the depression zone in the study area are superior, which are favorable development zones for lithologic gas reservoirs.