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歧口凹陷沙河街组发育沙一段、沙三段2套重要的烃源岩层系,烃源岩累计厚度达1 500~2 500m,有机质丰度高,为歧口凹陷提供了丰富的油气资源。但由于不同地区、不同层系原始沉积环境和后期演化程度的差异使得烃源岩的质量和分布有着很强的非均质性。如何客观地评价烃源岩质量,并对不同质量的烃源岩分布进行精细刻画,明确优质烃源岩的展布是当前研究的重点和难点。通过研究,建立了烃源岩分级评价工作流程,厘定了歧口凹陷不同次凹、不同层系有效烃源岩和优质烃源岩下限标准,明确了歧口凹陷沙河街组优质烃源岩的分布特点,提出生烃中心南移的新认识,有效指导了勘探方案的制定。
The Shahejie Formation in the Qikou Depression is characterized by two sets of important source rock strata in Sha-1 and Sha-3 Member. The accumulative thickness of hydrocarbon source rocks is 1 500-2 500 m. The abundance of organic matter is high, which provides rich oil and gas resources for Qikou sag. However, due to the differences between the original sedimentary environment and the late evolution in different regions and different strata, the quality and distribution of source rocks are strongly heterogeneous. How to objectively evaluate the quality of source rock and finely describe the distribution of source rocks with different qualities, so as to clarify the distribution of high-quality source rock is the key and difficult point in current research. Through the research, the work flow of source rock classification and appraisal was established, and the lower limit criterion of effective source rock and source rock of different subfacies and different strata in Qikou sag was determined. The source rock of Shahejie Formation in Qikou sag was identified Distribution characteristics, put forward a new understanding of hydrocarbon generation center southward, effectively guide the development of exploration programs.