Eastern Chongqing Carboniferous Huanglong Formation Reservoir Evaluation And Prediction, And Forming The Role Of Research

Western Hubei and Eastern Chongqing Region lays southeast border of Sichuan Basin with its area about 9500 km2. Qiyue Mountain anticlinal structure is on the east of it and Changjiang River on the west of it. After synthetically studying on effects of strata sequence, sedimentary fades, diagenesis function and storing-upping condition the author evaluates and forecasts carbonate reservoir of Hanglong Formation of Carboniferous in work area. And the author analyses and evaluates hydrocarbon source rock, caprock and trap reserving condition of work area on the base of drilling achievements of 7 emphases structure hi work area. Therefore the author draws two conclusion as follow: (1)the most favorable reservoir of the work area is the spreading region of dolomite rock of Carboniferous whose remaining thickness is greater than 20m with the region from Jiao 1 well-Cizhu 1 well-Maan 1 well to west of Shizhu County seat. The secondary favorable reservoir of it is the spreading region of dolomite rock with the remaining thickness greater than 10m but less than 20m which is eastern and western region of the most favorable region and the off-lying of Yangdu 1 well and Yangdu 2 well. The adverse reservoir of work area is the spreading region of limestone and dolomite rock with the remaining thickness less than 10m which is in- the southwest and east of the work area. (2)The most favorable region of gas formation lays inside of the Shizhu synclinore and in the west of Fangdou Mountain block. The secondary favorable region is from Zichuya region to Longjuba region. The adverse region lays Qiyue Mountain Structure including west of it and Fangdou Mountain Structure.