| The exploratory development of Yan chang oil formation Ying Wang oilfield has already been went on around 30 years. But it just obtains unprecedented progress at recently several years. At present in Guan ting and Miao wan these two rich oil areas it has been proven up that there are about 40km2 oil-bearing areas and 16,000,000 ton original oil in place were controlled. There are about 400 drilled wells and about 13,000 ton yearly production forecast. It has obtained the remarkable society and economic efficiency. Because the oil field production task tight, the technical personnel are few, petroleum geology basic research relatively weak, the systemic oil layer division and the test and analyze of reservoir has never been carried in essence; the synthetic study of petroleum geology in the sand through-going characteristic, sedimentary facies distributed characteristic, reservoir characteristic, concentration rule of oil and gas, the correlativity of four characters still is shallow. It will seriously be restricting the home court next exploration deployment and the effective development.In the article, using the analysis about the material of drilling, oil well logging, core sample, analysis chemical examination material, then we selected some representative sampling of prospecting well to carry on the analysis and the test, processing and the analysis with the professional software to the data, obtained the main understanding included:1. Grasped the especially low permeable reservoir petrology characteristics: the rock color, ingredient and structure of the research area.2. Through the reorganization analysis of each kind of log information from the laboratory test, obtains the reservoir various parameters and the before reciprocity as far as possible by accurately, for calculates various oil well logging parameter using the log information to provide the basis correctly.3. After carried on the standardization processed and adjusted the key bore logs of the different instrument series and the different wells of the research area, we have developed the porosity, the penetration coefficient explanation chart version and the water saturation explanation model.4. In this research area, the standard of the effective thickness lothological lower limit of this research area has been ascertained that it was the thin sandy siltstone; the rank of oil has been ascertained that it was oil trace level; the lower limit of Chang 2+3 oil layer: the porosity is 10%, the penetration coefficient is 0.2×10-3μm2, the lower limit of Chang 6- Chang 8 oil layer: the porosity is 8%, the penetration coefficient is 0.15×10-3μm2.5. The effective oil layer goes against bottom boundary has been ascertained by natural potential or the nature gamma curve half peak-to-peak value and the micro electrode curve and electrical resistivity logging curve synthetically. And rests on the research area bore log longitudinal resolution and the explanation precision and the compression fracture craft actual situation, buckled thickness to effective thickness beginning reckoning with the band to make the stipulation.6. The oiliness area, the effective thickness, the effective porosity, the primitive oil saturation, the ground crude oil density, in place oil reserves parameters and so on volume coefficient and primitive gas-to-oil ratio was ascertained; used the volumetric method to calculate Yingwang oil region forecast reserves result: petroleum forecast reserves of Chang 2+3 oil layer is 4521.9076×104t, petroleum forecast reserves of Chang 82 oil layer is 1513.7697×104t, petroleum forecast reserves of Chang 83 oil layer is 3003.4487×104t, sum total petroleum forecast reserves is 9039.1261×104t. And the recoverable resources are forecast.7. The classification and the appraisal of Yanchang formation reservoir in the research area has been done, and the reservoir sensitivity has been appraised.
|
PDF Full Text Request