东营凹陷沙三四段烃源层对陈家庄凸起的成藏贡献

Characteristics of possible source rocks in Dongying Sag and the accumulation model of Chenjiazhuang Bulge

为了研究陈家庄凸起的成藏模式,通过物性分析、原油生标特征分析及对东营凹陷沙三段沙四段烃源层进行特征分析,总结出陈家庄凸起成藏规律。通过对陈家庄凸起原油物性、地化特征以及原油组分碳同位素特征的分析,以及对伽马蜡烷、有机碳、氯仿沥青A等表征进行定量机理分析,依据地化特征统计、萜烷指纹分布特征对陈家庄凸起研究区的可能烃源岩进行分层分析,结合研究区块的地质储层构造特征对陈家庄凸起馆陶组油气成藏模式进行特征分析。研究发现,东营凹陷沙四段烃源岩存在3次排烃过程,其中后2次成熟期油气充注对陈家庄凸起浅层油气聚集具有意义。陈家庄凸起油气成藏的关键是东营凹陷沙四段深层油气向浅部的有效运移。研究结果为陈家庄凸起浅层油气勘探提供了一定的理论支撑。

In order to study the reservoir formation pattern of the Chenjiazhuang Bulge,physical analysis,crude oil biomarker characterization,and hydrocarbon source layer characterization of the Shasan Section 3 and Shasan Section 4 of the Dongying Sag were employed to summarise the reservoir forming law of the Chenjiazhuang Bulge.The physical properties of the crude oil,geochemical characteristics,and carbon isotope characteristics of the crude oil components of the Chenjiazhuang Bulge were analysed.The quantitative analysis was performed on the characterization of gamma waxy alkanes,organic carbons,and chloroform asphalt A,etc.Stratification analysis of the possible hydrocarbon source rocks of the Chenjiazhuang Bulge was carried out according to the statistics of the geochemical characteristics and the distribution of terpene fingerprint characteristics.Results show that there are three hydrocarbon drainage processes in the hydrocarbon source rocks of the Shasi Section 4 of the Dongying Depression,among which the last two maturation oil and gas charging are significant to the shallow oil and gas gathering in the Chenjiazhuang Bulge.The key to the oil and gas formation and reservoirization of the Chenjiazhuang Bulge is the effective transportation of deep oil and gas to the shallow part of the Shashi Section 4 of the Dongying Depression,which provides certain theoretical support for the exploration of shallow oil and gas in the Chenjiazhuang Bulge.