玛湖凹陷MH1井区上乌尔禾组扇控大面积成藏条件与成藏模式

doi:10.3969/j.issn.1006-6535.2021.01.006

摘要/Abstract

摘要： 玛湖凹陷二叠系上乌尔禾组继三叠系百口泉组之后又发现了一个大型连续型砂砾岩油气藏群。针对该区域成藏特征与成藏模式认识不清的问题。综合利用地质、地球物理以及分析化验等资料,结合区域构造背景与沉积环境,从烃源供给、储盖组合、运移通道及保存条件等4个方面对MH1井区上乌尔禾组油气成藏条件及控制因素进行综合分析。研究表明MH1井区上乌尔禾组砂砾岩油藏连续成藏具有4个有利条件:①二叠系风城组烃源岩具有有机质丰度高、生烃潜量大、双峰式生油特征,为MH1井区上乌尔禾组油藏提供了优质高效的烃源条件;②上乌尔禾组退积型扇体下砂上泥式沉积模式在纵向上形成规模有效的储盖组合;③断层、不整合面和渗透性砂体的三元复合体系共同形成了良好的立体输导网络;④扇三角洲平原亚相致密带、湖相与扇间泥岩以及断裂相互配置,形成复合式多面遮挡,为扇三角洲前缘大面积成藏提供了匹配良好的保存条件。在此基础上构建了MH1井区扇控大面积成藏模式,并在MH1井区开展了勘探开发一体化部署,获得了规模储量。该研究对下步油气勘探具有一定的指导意义。

关键词: 玛湖凹陷, MH1井区, 上乌尔禾组, 连续型油藏, 成藏条件, 成藏模式

Abstract: the Permian System Upper Wuerhe Formation of Mahu Sag is a large continuous conglomerate oil and gas reservoir group found after the Triassic System Baikouquan Formation. Based on the geological, geophysical and analytical data and regional structural background and sedimentary environment, the paper comprehensively analyzes the oil and gas accumulation conditions and control factors of Upper Wuerhe Formation in MH1 Well Zone from 4 aspects, i.e., hydrocarbon source supply, reservoir cap association, migration pathway and preservation condition. Research shows that the glutenite oil reservoir of Upper Wuerhe Formation in MH1 Well Zone has 4 advantages for continuous accumulation: ① The hydrocarbon source rocks of the Fengcheng Formation of Permian System are characterized by high organic matter abundance, high hydrocarbon generation potential and double peak oil generation, which provide high-quality and efficient hydrocarbon source conditions for the Upper Wuerhe Formation Oil Reservoir in MH1 Well Zone; ② The mud-on-sand deposition mode of the Upper Wuerhe Formation retrogradation-type fan body forms a large and effective reservoir cap association vertically; ③ The ternary composite system of faults, surface of unconformity and permeable sand bodies forms a good three-dimensional conducting network; ④ Subfacies dense zone on fan delta plain, lacustrine facies, inter-fan mudstone and faults are mutually distributed, forming a compound multifaceted shielding, which provides well matched preservation conditions for the accumulation in large areas in the front edge of fan delta. We hereby established the fan controlled large-area accumulation model in MH1 Well Zone and carried out integrated deployment of exploration and development with sizable reserves obtained. This research is of guiding significance for the oil and gas exploration of next stage.

Key words: Mahu sag, MH1 well area, Upper Wuerhe Formation, continuous reservoir, reservoir forming conditions, reservoir forming model

中图分类号:

TE122.2

卢红刚, 罗焕宏, 骆飞飞, 毛登周. 玛湖凹陷MH1井区上乌尔禾组扇控大面积成藏条件与成藏模式[J]. 特种油气藏, 2021, 28(1): 42-50.

Lu Honggang, Luo Huanhong, Luo Feifei, Mao Dengzhou. Fan Controlled Large-area Accumulation Conditions and Mode of Upper Wuerhe Formation in MH1 Well Zone of Mahu Sag[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 42-50.

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