The Relationship Of Structural Features And Hydrocarbon Accumulation Of Hei Di Miao Formation In YingTai Area, Da Qing Oilfield

Yingtai area is in the center depression which lies in the north of the Songliao basin. The north of Yingtai area is Longhupao-Daan terrace and the northeast is Qijia-Gulong depression. Structural trend of the target region is NS-NNE. Local structure and rifts of this area developed well. There are four rifts-NE-NNE, approximate N-S, NW-NWW and approximate E-W. And, some part traps were formed by fault-anticline, nosing structure and so on.The whole target region which lies in the west of Gulong depression, is the most beneficial part of the hydrocarbon migration pointing direction. The depositional system of Heidimiao formation pertains to low angle and shallow delta. Because of the low slope terrain, faint tectonic movement and controlled by north, north-east material source, traps developed very little and sand body distributed steady in this area. The sand body goes west and southwest direction becoming thinner and thinner and vanishes ultimately. In addition, this sand body has the geologic condition of block fault reservoir and fault-lithology reservoir when it matchs structure with east decline, N-E and N-W rifts.As for the Heidimiao formation, the beginning of exploration was very late. The structural features of top reflection stratum of Heidimiao formation is explained in this paper. At last, we confirm that Hala rifts is a banking belt of hydrocarbon by studying the distribution of sand bodes in horizontal and vertical direction, analyzing features of subprecipitation facies and the controlling affection of faultage on hydrocarbon, combining with the analysis of structural feature and development of rift in the target region .