Ordos Basin, Shanxi, Upper Palaeozoic Group Of Log Interpretation For The Establishment Of The Template

Yanchang natural gas reservoir is paleozoic lithologic gas reservoirs of low porosity, low porosity and low permeability. Permian Shanxi formation is one of the major gas producing segment of Yanchang natural gas reservoir. Currently, well beta series is complex in work area (such as3,700,5700and other logging), various logging interpretation methods and standards are not unified, caused the reservoir delineation become more difficult and fluid identification coincidence rate reduced. In order to ensure the rational application of well logging data, increase the rate of logging interpretation. According to current exploration situation, there is a need to summa regional law, give a uniform well log interpretation standards on the basis of log data standardizationThe research has applied multidisciplinary theories, such as Sedimentology, reservoir sedimentology,Petroleum Geology, combined Modern testing technology, focused on the comparison between the adjacent wells and adjacent blocks areas, payed attention to study on static and dynamic combined study, combined regional information and data, geological research and geophysical research methods, and do system research to the area. The research content mainly includes investigation and analysis of regional geological background, basic data collection and analysis of the study area, logging correction and standardization, the establishment of well logging interpretation model and gas reservoir log interpretation chart, a single well logging interpretation and multi-well comprehensive evaluation. Major progress is to establish fluid identification chart for Shanxi formation, the fluid identification plate and test result of anastomosis rate greater than85%, according to Shanxi formation geological realities, to establish reservoir Petrophysical parameters interpretation model, to select30wells to quantitative interpretation of single well review, the new results and fit test results back up to97, to analysis on distribution of fluid type on a flat surface, to eliminat the contradiction characteristics of interlayer and well fluid, and at last give a discussion on elastic wave velocity ratio, wave impedance parameters in the identification of reservoir fluid application., provide the scientific basis for further exploration and development of YanChang gas field.