大民屯凹陷静安堡西侧低潜山油气成藏条件分析

来源期刊:中南大学学报(自然科学版)2005年第2期

论文作者:郭建华 刘辰生 吴东胜 吴智勇

文章页码:329 - 334

关键词:潜山;成藏条件;油气运移;大民屯凹陷;渤海湾裂谷系

Key words:burial hill; condition of reservoir-forming; hydrocarbon migration; Damintun depres-sion; rift system of Bohai gul

摘    要:对钻井取芯和岩石薄片进行观察及分析化验,确定了组成渤海湾裂谷系大民屯凹陷静安堡西侧低潜山储层的岩石类型主要是碳酸盐岩和变质岩类,储集空间主要是孔隙和裂缝,组成了以缝洞为主的潜山型储层。通过三维地震资料的精细解释与构造成图,发现潜山顶面各类油气圈闭11个。研究结果表明:由于潜山的长期暴露和多期次的构造活动,有利于溶蚀孔洞和裂缝的发育;中新生代复杂的翘倾断块构造活动,形成了类型众多的油气圈闭;上覆老第三系沙三段与沙四段烃源岩厚度大,分布稳定,生油潜力大,因此,区内潜山具备了良好的油气成藏条件;油气运移聚集的主要通道是不整合面和断层,可将油气成藏模式总结为不整合-断层联合运移成藏模式、不整合垂向运移成藏模式、断层侧向运移成藏模式和断层-微裂隙垂向运移成藏模式。

Abstract: Based on the study of well-drilling, core rock section and the results of analysis and test datum, it is determined that the main rock types in Western Area of Jing′anpu of damintun depression lying in rift system of Bohai gulf are carbonate rock and metamorphic rock. Pore and fracture are the main reservoir spaces, and they form the burial hill reservoir in study area.Through the three-dimensional seism data explanation and structural mapping, 11 oil and gas traps are found on the top of the burial hill. Because of long-term exposure to atmosphere and many times of tectonic movements, the burial hill type reservoir has been developed. The main reservoir capacity is pore and aperture. The main source rock is the Sha-3 member and the Sha-4member of Paleogene that covered the reservoir. Because the source rock is thick and spreading steadily, there exists great potential for hydrocarbon generation. The main path for hydrocarbon migration and accumulation is unconformities and faults. On this basis, the model of hydrocarbon pool forming process can be concluded into four types as follows: migration and accumulation by unconformity and fault, vertical migration and accumulation by fault, lateral migration and accumulation by faults and vertical migration and accumulation by fault and micro-fracture.

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