Reservoir Geology Of Permian-Jurassic In Santanghu Basin, Xinjiang

Santanghu Basin lies in the north-east of Xinjian province, a congruent & reconstruct innertief , which developed on the basis of rift-fault basin of Permian , covered by Permian Series to Quaternary Series. Permian Series and Jurassic Series are the main oil and gas reservior. Permian Series lies in all over the Malang despression and the south of the tiaohu depression , It is confortable between each fm. and Jurassic Series scratch all over the basin , It is also confortable between each formations.This thesis is based on unitary, dynamic and synthetical study, which makes most use of various of data . All-sided study the Permian servior and the Jurassic servior from the point of resevior geology, the result is those following:The Permian reservior in santanghu basin , the low porosity and low permeability fracture carbonate rock reservior, of which the mid- Permian Series lucaogou formation is the most force reservoir. The class I reservoir spread mostly around the malang depression and the south of the tiaohu depression. The main sedimentary facies is deep lake, fairly deep lake and the shallow facies, while affected by the volcanic activity, which induce to the realitivily complicated source, on the hand of structure, two movements made an important role on this The Permian reservoir . one is the later Hercynian movement, which formed the fracture connected with the Juratype folds and thrust belt, the other is the later yanshan - early xishan movement, which mainly formed the some facture connected with the Juratype folds and thrust belt, and others connected with faulted anticline-faulted nose structure, which is mostly the effective fracture. The main reservoir rocks in the Permian reservoir include clastic rock, carbonate rock and tuff, of which the reservoir property of the carbonate rock is the best. The fracture and corroded pore are the the main reservior space. The fracture .mostly high-angle and vertical fracture , worked on the reservoir property tremendous. Most of the reservoir rocks has entered the late diagenetic stage. The carbonate rock is effected by the compaction, cementation, dolomitization and fracturing. The clastic rock is mostly effected by the compaction and cementation.the Jurassic servior in santanghu basin, he low porosity and low permeability poprositical clastic rock reservoir, of which the mid- Jurassic Series xishanyao formation is the most force reservoir. The class I , II reservoir lies in the jointof the tiaohu despression and the malang depression . the heterogeneity of porosity and permeability is influenced by the soil-temperature and the sedimentary facies. the main sedimentary facies include meandering river . braided stream . the delta, and lake facies, The reservoir space include the corroded pore and microfacture. the reservoir rock has mostly enterned the late diagenetic stage. The diagenetic include the compaction. cementation and the dissolution. the resulting of the modle experience shows that there are three displacement means - double medium. fracture and the pure porosity . The fracture and the porosity structure have a great influence on the reservoir property and displacement. The weaker the heterogeneity of the pore texture, the higher oil saturation .The displacement efficiency is dependent on the permeadility while the heterogeneity of pore texture is similar.