Research On The Mechanisim Of Reservoir In The South Of Binxian Rise

During the exploring and developing period for more than 40 years in the area of south of BinXian Rise(Shan Jiasi Oilfield),six oil-bearing payzones ,Nm,Ng,Ed,Es1,Es3 and Es4,have been found, with the proven oil area for 41.23Km~2,9930.63×10~4 tones proven reserves. More than ten thick and thin oil blocks ,such as Shan2,Shan10 and Shan6 blocks, have been developed with the developed reserves for 9930.63×10~4 tones, recoverable oil reserves is 1622.4×10~4 tones, and cumulative oil production is 1200.0861×10~4 tones. High degree period of exploration is the characteristics of the whole area, the other is the the smaller exploration area(there are 145 wells in the area of 80 square kilometers,1.81 wells per square kilometers),then the difficulty of further exploring is harder, and the resources succeed contradictions is more seriously.There are multi-layers stratigraphic-overlap thick oil reservoirs around BinXian Rise shows by the practices of exploring and developing, including Es3,Es1,Ed and Ng, the reservoirs of N1g1 has been distributed the biggest area in Shanjiasi Oil-field, the only one which over-lap Binxian Rise direct, from the Shan6 and Shan2 Block in the west to the Shan10 Block in the east. According to the current geology research, there are three sand-bodies in N1g reservoirs in this area ,and thick layers and block are the characteristics of them, which is belong to small-size Fan sedimentary facies around the Rise in early period, and turn to Braided river sedimentary facies N1g2,which has the feature of depression period, so ,there are more areas for N1g1-2 sand-bodies up to the north to the Rise. There are oil and gas appearances from the early Exploration wells outsides the borders of early proven reserves in the Shan2 and Shan10 Block in the east of Shanjiasi Oilfield, such as the well Shan82,which has 8 meters thick payzone in the under part of N1g,and the well Shan5 and Shan70 also have thin ones.In order to expand the oil-bearing area of Shanjiasi Oilfield,look for the new reserves position and keep the production stable,the research on the structure, formations, sediments, payzones and mechanism of reservoirs have must been executed. This paper is just based on the stratigraphic correlation and division, multi-parameters comprehensive calibration, the structure and fault system have been determined through the fine structural interpretation ,and the over-lap borders determined by the use of analysis technology of seismic coherence, the distribution features of the stratigraphic have been described through analysis technology of seismic properties, and at last, the distribution feature of the pay zone has been described quantitatively by the use of the technology of logging constrained inversion ,the exploration aim have been determined and to solid the base of reserves and production for the Oilfield.