兰家—合隆—布海地区天然气浅层富集规律与勘探意义

doi:10.3969/j.issn.1672-7703.2018.03.010

摘要/Abstract

摘要： 兰家-合隆-布海地区断陷-坳陷期构造复杂，长久以来在区域构造、气藏特征方面缺乏全面、规律性的了解。为揭晓兰家-合隆-布海地区天然气浅层成藏与深层烃源岩之间关系，利用气区构造解析理论对断裂-坳陷-反转演化阶段盆地样式、构造单元、断裂演化特征进行研究，综合构造反转作用对深层断裂、地层沉积的影响，建立天然气浅层运移成藏模式。结果显示：持续断陷型盆地样式和沉积继承型盆地样式具有区域性构造沉降的稳定沉积环境和良好的生储盖组合，叠合反转型盆地样式发育深层断裂、不整合面、层间滑脱面，进一步贯通浅层储层与深层烃源岩，形成"深部生烃-纵向输导-浅层有利区聚集"成藏模式。针对不同构造带显现出天然气主要输导体系和成藏类型，直观地区分出勘探风险区和有利区。

关键词: 浅层, 反转, 断裂, 输导体系, 成藏类型

Abstract: The fault and depression structures in the Lanjia-Helong-Buhai area is very complex and have not been understood comprehensively and regularly in their regional structures and gas reservoir properties for a long time. In order to reveal the relationship between the shallow gas reservoir and the deep hydrocarbon source rock in the Lanjia-Helong-Buhai area, the tectonic analysis theory for gas provinces was used to analyze the basin patterns, tectonic units, and fault evolution characteristics in the fault-depression-reversion stage, and based on which a shallow gas migration and accumulation model was built by incorporating the effects of tectonic reversal on deep faults and stratigraphic sedimentation. The results show that the continuously faulted and the sedimentarily inherited basin patterns had a stable sedimentary environment with regional tectonic subsidence and good source-reservoir-cap rocks assemblages, while the superimposedly inverted basin pattern developed deep faults, unconformities and interlayer detachments, which further communicate the shallow reservoir with the deep source rock, forming a model characterized by "deep hydrocarbon generation-vertical migration-favorable shallow reservoir accumulation". Finally, the main gas transport systems and reservoir types were revealed, and the risk-taking and favorable exploration areas were clearly identifed in different tectonic belts.

Key words: shallow reservoir, reversion, fault, transport system, accumulation model

中图分类号:

郝猛, 胡望水, 李涛, 余振宇, 郭先涛. 兰家—合隆—布海地区天然气浅层富集规律与勘探意义[J]. 中国石油勘探, 2018, 23(3): 81-89.

Hao Meng, Hu Wangshui, Li Tao, Yu Zhenyu, Guo Xiantao. The shallow accumulation law of natural gas in the Lanjia-Helong-Buhai area and its exploration signifcance[J]. China Petroleum Exploration, 2018, 23(3): 81-89.

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