The Study Of Sedimentary Characteristics And Oil-gas Accumulation Regulation Of The Chang6Oil Reservoir In North Chuankou Oil Field

The northern part of ChuanKou Oil Field locates on the east slope belt of Ordos Basin, its main purposed formation of exploration is Chang6oil layer of the Upper Triassic YangChang Reservoir. This paper researched the provenance analysis, sedimentary facies recognition and the classification and correlation of Chang6oil layer of the Upper Triassic YangChang Reservoir, and analyzed the sedimentary faces and the exhibition of the sand body in the study area based on the data of the adjacent outcrop and amount of drilling cores observation and description, using the thin section analysis, property analysis, grain size analysis, and testing material, as well as logging and oil test data, and combing with the theory and research methods of the sedimentology, logging geology, petroleum geology, In the same study based on comprehensive analysis, summarized enrichment regularity of oil and gas of Chang61and Chang62in northern area of ChuanKou Oil Field, and predicted the favorable blocks of Chang61and Chang62-oil reservoirs.Used the marker formation in the study area, combined with sedimentary cycle and the principle of the thickness of strata, according to the traditional division method, this study divided Chang6into four sections:Chang61, Chang62, Chang63, Chang64. Through outorop observation, combined with Previous researeh results, we hold that the northern part of ChuanKou Oil Field source of the Upper Triassic YangChang Reservoir is mainly from the north-eastern Department., at the same time, through the systematic study of the northern part of ChuanKou Oil Field source of the Upper Triassic YangChang Reservoir sdimentary system in studied area based on the analysis of provenance. Based on the mark of sedimentary facies classification of the study area, the study considered Chang61-1. Chang612is delta plain faces, Chang62-1, Chang62-2is delta front faces. And several microfacies are distinguished. Among this the developed distributary channel, underwaterdistributary channel is the main reservoir.Throungh the comprehensive analysis, the study believed the oil formation has good relations with the sedimentary facies, sandbody distribution, and the distribution features of the property; the main river channels with developed sand and good property are the favorable area for oil and gas enrichment, the nose type structure has no obvious control function on the oil and gas concentration. Based on the oil and gas accumulation regular research foundation, the study predicted the favorable area of Chang61and Chang62, and provided the sufficient geological basis for the next exploration and development of Chang6Oil Field.