Bedrock reservoir of Jingbei buried hill in Damintun Sag, Liaohe Depression

The strata of the Jingbei buried hill are made up of carbonate rocks in shallow sea and clastic rocks on shore in the Middle Proterozoic, mainly are carbonate rocks, quartz sandstone and argillaceous rocks. The rocks have experienced the following three periods: diagenesis of the dolomite, weathering corrosion-cementation and light metamorphosing. However, the key influencing factors which decide the reservoir capability have not been recognized. The developmental history and the storage feature of the reservoir are analyzed from tectonics and sedimentology. The log data are applied in studying the lithology and fractures to research the spatial distribution rules of the reservoir. With the evaluation result of the bedrock reservoir from the oil testing, the control factors affecting the reservoir development and storage capability are analyzed and summarized. It is showed that the control factors are lithology and lithologic association, diagenesis, weathering, and tectogenesis. Depositional environment decides the lithology and lithologic association; lithology and diagenesis decide the development of the primary pores and secondary interstices; weathering and tectogenesis control the oil storage and reconstruct the storage space.