Characteristic Study Of Chang2Reservoir In Qingyangcha Oil Field

This article comprehensively use the theory and method of sequence stratigraphy, structural geology, sedimentary petrology, reservoir geology, petroleum geology, geological logging and other related disciplines, theories and research methods as a guide. Based on logging data, combined with logging,and laboratory analysis of core information, we made researches of fine reservoir stratigraphic division and correlation of sedimentary facies analysis, reservoir sand body distribution and characteristics of research for the study of Chang2formation in Qing yangcha Area.The PaPer conclusion that Chang2belonged to lake delta plain, the provenance was from north east and mainly developed two deposits micro-phase type of plain distributary channel and interchannel. The sand body distribution strictly controlled by sedimentary facies, channel sand sand for the skeleton, Chang21-1, Chang21-2,Chang21-3sand body has a good inheritance. Chang2reservoir is fine-medium-grained feldspathic sandstone compositional maturity is low, sub-select, etc. a good, Chang2reservoir is15.85%average porosity and permeability average of24.63×103μm2, that it belongs to the hole in the low-permeability reservoirs. Diagenesis strong intergranular corrosion hole is the most important types of secondary porosity. Comprehensive evaluation of micro-pore region Chang2reservoirs are mainly in low-permeable hole, part of the permeable and low permeability type. Classification and evaluation of the reservoir, the Chang2reservoir is typically Ⅱ a and Ⅰ b type, secondarily of Ⅰa, Ⅱ b type, Ⅲa, Ⅲb class and Ⅳ rarely, Ⅰ+Ⅱ class of effective reservoir accounted for the total reservoir amount of81.63%. Chang2average reservoir water saturation of37.4%, the isotonic point average water saturation of56.7%, residual oil saturation of32.8%. Isotonic point of saturation, indicating the hydrophilic reservoir, and wettability determination consistent with the results.We overally examine the sedimentary microfacies, sand distribution, reservoir properties and reservoir comprehensive evaluation of various factors, Seleete the favorable area for prospecting of Chang2formation. These above Provide evidenees for further exploration and exploitation.