Reservoir Haracteristic And Oilfield Development Of Fractured Reservoir In Northwestern Margin Of Qaidam Basin

Northwest margin of Qaidam Basin's crack reservoir development has a long history, but has not clearly understand reservoir characteristics, development issues such as poor efficiency has been very prominent. Based on the results of previous studies concluded on the basis of summing up the cracks in the reservoir area characteristics, and boldly against the cracks in the northwest edge of Qaidam Basin, the reservoir development process, the right of oil in the practical application of the You quan zi oil field winding Screen End Well Technology and small acidification of Technology, to take the good results.The Qaidam Basin northwest reason located at the Qaidam Basin northeast, on the tectonic element belongs to the Qaidam Basin first-level tectonic element vast cliff to be hollow, the Cainozoic Era hollow stable growth, has deposited the great thick this time stratum, under dwarf Luo Tong, does Chai Gouzu to deposit up and down the heavy film hydrocarbon source rock. Hollow interior secondary hollow and bulge interaction distribution, is in turn from east to west, Yiliping depression, Da feng shan structural belt,You bei depression, Youquanzi structure belt,Ying xiong ling depression, Yaaz depression, north Qi structural belt. Because of the giant Ahl gold break's writing from right to left sways from side to side, causes this local the structure to assume the belt-shaped distribution the characteristic, moreover constructs the trend to assume the cubic centimeter - north west - north cubic centimeter north from north to south to approach the mop, The overall assumes instead"S".Because the tectonic movement is intense, in the area the fold, the fault growth, cause the stratum rock breaking, the crack growth, because this kind the structure distortion forms build joint for home court crack oil deposit main accumulation space According to the crack growth characteristic's difference and the relation, in the area the crack may divide is 3 types, is called"Nan yi shan type","Xian shui quan type"and"Shi zi gou type". In the structure advantageous spot oil gas along channel migra -tion and so on fault, transfusion level and plane of unconformity gathers the cracking oil deposit to the crack.In view of the Qaidam Basin northwest reason crack oil deposit's characteristic, summarizes local district magistrate the time development practice experience, we proposed may prevent the conventional well completion way cement permeating crack jamming crack the kelp winding sieve tube well completion; Acidifiable to depth portion stratum small acidification processing technology; Maximum limit the expanded irrigation affected area's gradation striation irrigation and the cyclic flood -ing comprehensive utilization and together with the high angle build joint, increases massively releases the oil area the big displacement slant hole, the horizontal well and so on special mining way. Passes fries in You quan zi oil field to indicate these pointed mining way economy using the practice effective feasible.