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本文简要叙述了沉降中心、沉积中心及与生油层的关系,并从盆地的岩性、厚度变化、主要搬运水系、沉积旋回、湖泊演化等方面,推测一里平凹陷在渐新世一中新世为一沉降中心,并非利于生油的沉积中心。该凹陷岩性纵向上由下至上变细,已钻的层位中,油沙山组岩性最细,经生油层研究,已属非生油岩范畴。因之,一里平凹陷中的干柴沟组亦不是较好的生油层,其生油性不及油沙山组,故对一里平凹陷评价较低。
This paper briefly describes the relationship between the subsidence center, sedimentary center and the oil-bearing formation. It is inferred that the Yiliping depression is a new medium in the Oligocene from the aspect of the lithology and thickness of the basin, the main moving water system, sedimentary cycle and lake evolution The world is a settlement center, is not conducive to the oil deposition center. In the sag, the lithology of the sag is narrowed from bottom to top. Among the strata that have been drilled, the Yansha Mountain Formation has the finest lithology and has been studied as a non-source rock in the study of oil-bearing formations. As a result, dry-chai ditch in Yiliping depression is not a good oil-producing layer, which is inferior to Yousha mountain formation in oil generation. Therefore, the evaluation of Yiliping depression is low.