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东营凹陷南坡东段丁家屋子与八面河构造带之间的鞍部,新发现了王146区块沙四段油气藏。该油气藏埋深为1462.9～1748.5m,但原油物性表现为高密度、高粘度和低凝固点的特征,为典型的深层稠油油藏,对其油气运移及聚集规律仍不清楚,缺乏对深层稠油油气藏形成机理的研究。基于单井原油物性资料及其标志性化合物特征分析,明确了研究区油气主要来自于沙四段烃源岩,油气自生油洼陷向外运移过程中即开始发生降解作用;依据原油降解程度的差异,进一步明确研究区存在2条油气优势运移路径,一条主要沿丁家屋子构造带走向运移,另一条主要沿八面河构造带走向运移。其中油气沿丁家屋子构造带走向运移过程中的降解作用最为强烈,从而导致王146区块深层稠油油气藏的形成,因此沿着油气优势运移路径区域仍具有广阔的勘探前景。
The fourth member of Shahejie Formation of Wang 146 block was newly discovered in the saddle between Dingjiawuzi and Bamianhe tectonic belt in the eastern slope of Dongying Sag. The buried depth of this oil and gas reservoir is 1462.9 ~ 1748.5m. However, the physical properties of crude oil are characterized by high density, high viscosity and low freezing point. It is a typical deep heavy oil reservoir, and its hydrocarbon migration and accumulation are still unclear. Study on Formation Mechanism of Deep Heavy Oil Reservoirs. Based on the single well petrophysical data and the characterization of its signature compounds, it is clear that the hydrocarbon in the study area mainly comes from the source rocks of Es4, which begins to degrade during the outward migration of oil and gas from the oil sags. According to the degree of crude oil degradation , Further clarified that there are two dominant migration paths for oil and gas in the study area. One is mainly transported along the tectonic belt of Dingjia house and the other is mainly migrated along the Bamianhe tectonic belt. Among them, the degradation of oil and gas along the migration direction of Dingjiawuzi tectonic belt is the strongest, leading to the formation of deep heavy oil and gas reservoirs in Wang 146 block. Therefore, there is still a broad exploration prospect along the dominant migration path of oil and gas.