缅甸D区块超压气藏成藏主控因素

摘要/Abstract

摘要： 缅甸D区块位于伊洛瓦底盆地最富油气的西部深坳带，目前在始新统塔本组钻探3口井测试获高产气流,表明该区块具有一定的勘探潜力。但该区块整体勘探程度较低,始新统主要目的层普遍存在超压，成藏条件复杂，超压体系内油气富集的主控因素不明确，大大增加了未来勘探的风险。通过大量统计分析全球具有代表性的超压油气藏,结合D区块最新的地质认识及勘探成果,并与邻区油气藏进行对比分析认为：缅甸D区块发育两套烃源岩，原地发育的塔本组烃源岩埋藏浅，演化程度低，因此油气可能来自区块相邻生烃凹陷或者深部的朗欣组烃源岩；缅甸D区块超压带内部成藏主要受控于储层及保存条件,有效的运移输导体系与时空配置是油气富集的重要因素；缅甸D区块缺少南部沙林凹陷渐新统优质储层，主要储层为塔本组中孔、低渗砂岩，因此纵向上应当重视超压体系中次生孔隙、裂缝发育段；D区块断层下盘油气保存条件相对较好，是勘探的重要领域。

关键词: 缅甸D区块, 成藏条件, 超压, 成藏主控因素, 勘探领域

Abstract: Block D in Myanmar is located along the hydrocarbon-richest west deep depression zone in the Ayeyarwady Basin. Presently, high-yield gas flows have been obtained through testing of 3 wells drilled in Taben Formation of Eocene System, indicating that this block has a certain exploration potential. However, this block features a low overall degree of exploration, widespread presence of overpressure in major target layers of Eocene, complicated accumulation conditions and unclear main factors controlling enrichment of hydrocarbon within overpressure system, thus significantly increasing future exploration risks. Through statistical analysis of worldwide representative overpressure hydrocarbon reservoirs and correlated analysis carried out in adjacent counterparts according to the latest geologic knowledge and exploration results regarding Block D, it is believed that two sets of source rocks exist in Block D – Taben and Langshing. The autochthonously developed source rocks of Taben Formation are characterized by shallow buried depth and low degree of evolution. Accordingly, the hydrocarbon is supposed coming from genetic depressions adjacent to the block or the source rock of Langshing Formation deep down. Accumulation inside the overpressure zone in Block D is primarily controlled by reservoir and preservation conditions. The effective migration-transport system and spatiotemporal allocation are important factors for hydrocarbon enrichment. Block D is lack of high-quality reservoirs of Oligocene like in the south Salin depression and its major reservoirs feature medium-porosity, low-permeability sandstone of Taben Formation; therefore, high importance should be attached to secondary pore and fracture intervals in the overpressure system vertically. The lower wall of the fault in Block D is an important area of exploration due to its relatively good hydrocarbon preservation conditions.

Key words: Block D in Myanmar, accumulation conditions, overpressure, main factors controlling accumulation, area of exploration

石磊, 李富恒, 殷进垠, 田纳新, 郭金瑞, 朱卫华. 缅甸D区块超压气藏成藏主控因素[J]. 中国石油勘探, 2016, 21(2): 69-77.

Shi Lei, Li Fuheng, Yin Jinyin, Tian Naxin, Guo Jinrui, Zhu Weihua. Main factors controlling accumulation of overpressured gas reservoir in Block D, Myanmar[J]. China Petroleum Exploration, 2016, 21(2): 69-77.

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