Period-divided and reason-divided prediction evaluation method of natural fracture in gas reservoir

Abstract

The invention provides a Period-divided and reason-divided prediction evaluation method of a natural fracture in a gas reservoir. The specific implementation scheme comprises a step of obtaining a fracture filling sample, a step of carrying out period-divided matched analysis on the sample, a step of carrying out a rock sound emission experiment to simulate and recovery the memory period of a rock fracture, a step of determining a cause type, a step of determining the formation period and reason type of a natural fracture and dividing the natural fracture system in the gas reservoir into a plurality of natural fracture sub systems with single periods and single reasons, a step of carrying out comprehensive superposition on the prediction result of each natural fracture sub system to form a prediction result, and a step of carrying out comparison analysis on the obtained prediction result and fracture development. By employing the above technical scheme, the multiple-period and multiple-reason complex natural fracture network system is divided into multiple natural fracture sub systems with single periods and single reasons to be a basic research object through period separation and reason type determination, and the precision of gas reservoir natural fracture prediction is improved.

Description

technical field [0001] The invention relates to the field of exploration and development of fractured oil and gas reservoirs, in particular to the field of prediction and evaluation of complex fracture network systems formed by superposition of multiple stages and multiple causes in geological evolution history. Background technique [0002] Natural fractures are a geological structure phenomenon widely developed in strata. In the process of oil and gas exploration and development, natural fractures often play the role of storing oil and gas and dredging oil and gas, which is the key to the exploration and development of fractured oil and gas reservoirs. At present, more than 40% of the world's oil and gas production is produced in fractured reservoirs, and one of the keys to the exploration and development of fractured reservoirs lies in the prediction and evaluation of natural fractures. A lot of work has been carried out at home and abroad on the research on natural fract...

AI Technical Summary

Problems solved by technology

[0016] Due to the complexity of natural fractures in oil and gas reservoirs due to the superposition of multi-periods and multi-genetic types, the present invention aims at the incompatibility of existing prediction and evaluation techniques, and proposes to combine multi-stage and multi-genetic types of complex natural fracture network systems through period In order to simplify the research problem, the sub-stripping and genetic type determination will be divided into a single period and a single genetic type of natural fracture subsystem as the basic research object; For the purpose of matching the dynamic data, the research idea of ​​gradually approaching the theoretical research understanding to the actual geological situation through cyclic iterative inspection and correction

Images