The Oil And Gas Accumulation Of The Putaohua Reservoir In The Edge Of The Fifth Oil Production Plant Of Daqing Oilfield

The fifth production plant of Daqing oilfield is located in wide and gradual anticlinal beltin Daqing placanticline of songliao basin, that is the third stage structural unit of the basinwhich is located in the central part of the central depression area. And it is the edge oftransition of Daqing placanticline second stage structural unit to Sanzhao sag which includedsouth of Xingshugang tectonic zone, Gaotaizi tectonic zone and Taipingtun tectonic zone. Asthe Putaohua oillayer present different reservoir type and different distribution characteristicsof oil and water in different tectonic position, so we have studied the reservoir accumulationmodel in slop area of fifth production plant of Daqing oilfield based on the differentdistribution characteristics of reservoirs.We have made careful division of tectonic unit inresearch area by full use of the available data and analysis the development characteristics offault, the distribution characteristics of sand body of reservoir and the distributioncharacteristics of oil and water. And analysis the main controlling factor then establishedhydrocarbon accumulation mode of the research area.This paper has made the careful division of structure in research area and developmentcharacteristics of faults. Combine the different distribution characteristics of oil and water indifferent tectonic position and the vertical distribution characteristics of oil and water we haveconcluded the distribution characteristics of oil and water in plane. It shows the characteristicof―zoning in east and west, blocking in north and south‖. At the same time, we make theanalysis on main control factors of oil and water distribution. Oil and gas accumulation of theslope area depends on occlusion condition. Therefore the main control factors of oil andwater distribution of slope area have three point: first, the oil and water distribution is macrocontrolled by tectonic development characteristics; secondly, the configuration of fault andsand determines whether the accumulation of oil and gas or not; finally, the lateral sealcapacity of fault determines the degree of the oil and gas accumulation.By means of the study of tentonic characteristics, fault sealing ability and therelationship between fault and the sand body in research area we have concluded thehydrocarbon accumulation mode of research area. It shows that: in the north part of researcharea, west limb of anticline of the steep slope belt form the lithologic reservoir and tectoniclithologic reservoir, limb of anticline of the gental slope belt form the fault block reservoir;while in the south part of research area the east part of it mainly forms fault block reservoirand fault lithologic reservoir and the west part of it mainly forms fault block reservoir and anticline reservoir.