Fine Description Of The Wu-Baiti Reef Gas Reservoir

Wubaiti structure is located at Wubaiti ~ Yihechang field area within Kaijiang County in Sichuan Province and Kaixian County in Chongqing Municipality,including theYihe,Zhonghe,Jiangye,Nanye and other township's area.Wubaiti structure is a Minor axis anticline at the northern end of the steep Datianchi Tectonic zone in Eastern Sichuan.ti is about 24km long and about 6.5km wide in the direction of EW.It has a form of a box-shaped section. Wubaiti reef gas reservoirs developes in a nosing structure within southeastern Wubaiti tectonic .Wubaiti reef gas reservoir developes on the Changxin formation of the Upper Permian series . On December 15, 1992,Changxing reef gas reservoir was put into production test.In 2001,the development program of Changxing reef gas reservoir was prepared on the basis of the Proved reserves about 47.23×10~8m~3. By April 2010, a total gas production well 8, the cumulative water production 11.81×10~8m~3, total gas production 16.07×10~8m~3The gas reservoir in the development process, showing what the main conflict:First, part of the tectonics needs to be further implemented.Second, the wells'productivity of the gas reservoir is generally low and quite different ,and producing reserves is unbalanced.Third, the remaining gas reserves and the distribution is unclear, that makes tapping the potential difficult.In this paper, aiming at the Changxing reef gas reservoir of Wubaiti ready for research.Based on previous research,take the reservoir geology ,geology in reservoir development, sedimentology ,logging as a guide .Comprehensively apply the geology,logging,testing,analysis of drilling core ,production performance data and so on to studuy the gas reservoir's structure, stratigraphy characteristics, facies, diagenesis, reservoir characteristics,fluid properties, connectivity, gas reservoirs type,pressure system,dynamics of production, productivity features and so on. On this basis,using computer reservoir three-dimensional geological modeling technology to build the static model of the reservoir,evaluate the static and dynamic reserves and the utilization of the reserves.Through the establishment of numerical simulation model, history matching and other phases to forecast current distribution of remaining gas.This paper also makes some useful exploration in the field of the remaining gas distribution method,and use Well Reserves Evaluation Method to calculate the distribution of the remaining gas reserves.Finally, Combinate the numerical simulation results,evaluation of the producing reserves and WREM to analyze the potential of this reservoir.Through the comprehensive research,we can draw the conclusion that southern reservoir has huge potential and suggest sidetracking the td021-4 well so as to tap Hydrocarbon potential.