源断盖配置油气聚集时期预测方法及其应用

doi:10.7657/XJPG20240102

摘要/Abstract

摘要：

为确定含油气盆地油源断裂处油气富集程度，在烃源岩、断裂和盖层配置及油气聚集机制研究基础上，通过油源断裂活动期、烃源岩排烃期和泥岩盖层形成期，建立了一套源断盖配置下的油气聚集期的预测方法，并利用其预测渤海湾盆地歧口凹陷沙一下亚段内油气聚集时期。结果表明，沙三段烃源岩排烃、南大港断裂开启和沙一中亚段区域性泥岩盖层形成，均为馆陶组—明化镇组沉积期，三者配置关系良好且时期较长，有利于沙三段烃源岩排出的油气在沙一下亚段内聚集成藏，预测结果与勘探成果吻合。

关键词: 渤海湾盆地, 歧口凹陷, 沙河街组, 烃源岩, 油源断裂, 盖层封闭性, 油气成藏

Abstract:

To determine hydrocarbon enrichment degree around the faults connecting oil and source rocks in petroliferous basins，based on the study of source rock-fault-caprock configuration，and the hydrocarbon accumulation mechanism，a method for predicting hydrocarbon accumulation period under source-fault-caprock configuration was established，which considers the activity period of the fault connecting oil and source rocks，the hydrocarbon expulsion period of source rock，and the formation period of mudstone caprock. The method was applied to predict the hydrocarbon accumulation period in the lower Sha 1 member within the Qikou sag of the Bohai Bay basin. The results show that during the deposition period of the Guantao formation-Minghuazhen formation，the source rock in Sha 3 member expelled hydrocarbons，the Nandagang fault was opened，and the regional mudstone caprock in the middle Sha 1 member was formed. The source rock，fault and caprock were configured well for a long period，which allowed the hydrocarbons expelled from the source rock in Sha 3 member to effectively accumulate in the lower Sha 1 member. The prediction results are consistent with the exploration results.

Key words: Bohai Bay basin, Qikou sag, Shahejie formation, source rock, fault connecting oil and source rock, caprock sealing, hydrocarbon accumulation

中图分类号:

TE122.1

丛岩. 源断盖配置油气聚集时期预测方法及其应用[J]. 新疆石油地质, 2024, 45(1): 13-18.

CONG Yan. A Method for Predicting Hydrocarbon Accumulation Period Under Source-Fault-Caprock Configuration and Its Application[J]. Xinjiang Petroleum Geology, 2024, 45(1): 13-18.

图/表 6

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