Forecast Benefitial Location Of Well In Chang81-1 Block

Through reservoir description in late two years,Fuyu oil layer in Chang 81-1 block belongs to the channel sand body deposition,and effective thickness is big.But in some situation there are water or gas in testing for oil.And in some districts there is the phenomenon of oil/water inversion, relatively complex oil-water distribution. This paper aims to contrast small layers, sedimentary microfacies and water and integrated interpretation work of oil and gas, and oil and gas in the studied area the distribution of water in vertical and horizontal research, finally combining the calculation of reserves in the study area as a result, forecasting benefitial location of well in Chang81-1 block for the next development plan to provide the reference for the study area.Through a series of studies, the in the study area have achieved the following results:1. Through the comparison of "cycle", picked fuyu reservoir is divided into FI, FII and FIII of three oil layer group, helped FI group of sandstone reservoir points up, middle and down three groups,seven sublayers in total; FII sandstone reservoir points into the two groups, five sublayers in total.2. Through the analysis and comparison of the core data and the log, determine the five types of sedimentary microfacies in the studying area, the underwater distributary channel, water distributary channel, crevasse channel and flood plain mud, distributary bay. Through the analysis of the seismic attribution, seismic inversion, and normalization of the log, I also predict the the distribution of the sand body. At last, by the use of logging and seismic, I also predict the distribution of the sedimentary microfacies in plane.3. When expaining oil, gas and water and predicting their distribution, at first, through the research of the lithology, physical property, electrical property and oilness, it builds the interpretation chart in the study area; secondly, it forms standardized of physical and electrical property of the effective thickness by the experience, oilness attitude and logging; thirdly, it builds the explaination model by using logging and core data; last, it utilizes the chart and standard to identify the oil, gas, and water, and predicts their boundary and distribution. Because of the work above, there isn’t clear boundary in vertical; but complex oil-water diatribution, mainly concentrated in 3rd and 4th of the north and 7th and 8th in middle east area.5.Utilizing volumetric method to double calculation of reserves, it analysises that the decreasing oil area leads to the decreasing reserves; Combinating the geological research with the result of the calculation, it shows that the benefitial area location of well distributs the FI1, FI4, FI5, FI7 in vertical and the southwest part of the area in plane.