Characteristics of hydrocarbon distribution and analysis of the main controlling factors for reservoir formation in the central and southern anticline zone of XH Depression
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摘要:
为了厘清XH凹陷中南部背斜带的油气成藏主控因素，解剖了中南部T气田、H气田、R气田等3个典型油气田。研究表明：中南部背斜带油气成因、来源和成藏期次一致，但油气分布却存在显著差异性，主要表现在富集程度、纵向分布层位和平面赋存位置3个方面。分析认为，造成油气分布差异性的主控因素为断裂系统、烃源岩分布、源-储构造叠合关系和断-砂耦合关系。断裂系统的差异性决定纵向上油气分布层位以及构造内部的差异化富集程度；平湖组煤系烃源岩成熟度和厚度分布的差异性决定区域油气富集程度；花港组源外成藏背景下，成藏期平湖组烃源层顶面构造与花港组储集层构造叠合关系决定局部构造汇烃强度；中南部花港组强水道化背景下，断层与砂体耦合关系决定单层油气成藏规模。
Abstract:In order to clarify the main controlling factors for reservoir formation in the central and southern anticline zone of XH Depression, three typical oil and gas fields in the central and southern part, including T Gas Field, H Gas Field, and R Gas Field, were dissected. The results showed that the source and accumulation stage of hydrocarbons in the central and southern anticline belt were consistent, but there were significant differences in hydrocarbon distribution, mainly manifesting in three aspects: enrichment degree, vertical distribution horizon and plane occurrence location. The analysis believed that the main controlling factors causing the differences in hydrocarbon distribution were fault system, hydrocarbon source rock distribution, source-reservoir structural overlap relationship, and fault-sand coupling relationship. The difference of fault system determined the vertical distribution horizon of hydrocarbons and the differential enrichment degree inside the structure; the difference of maturity and thickness distribution of coal measure source rocks in Pinghu Formation determined the regional hydrocarbon enrichment degree; under the background of hydrocarbon accumulation outside the source rocks in Huagang Formation, the overlap relationship between the top surface structure of Pinghu Formation source rocks and the reservoir structure of Huagang Formation determined the local structural hydrocarbon accumulation intensity; and under the background of strong waterway in Huagang Formation in the central and southern part, the coupling relationship between faults and sand bodies determined the hydrocarbon accumulation scale of single layer.
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