Four-quadrant reservoir stratum type identification method and system

Abstract

The invention discloses a four-quadrant reservoir stratum type identification method and system, wherein the four-quadrant reservoir stratum type identification method comprises the following steps: selecting a core sample, and acquiring the mud filtrate specific resistance and electrical imaging logging information of a well corresponding to the core sample; performing CT scanning imaging on the core sample to generate a CT imaging pore distribution spectrum of the core sample; according to the mud filtrate specific resistance and the imaging logging pixel conductivity, computing an electrical imaging porosity spectrum of the well corresponding to the core sample by utilizing the Archie's formulas; calibrating the electrical imaging porosity spectrum corresponding to a stratum segment by utilizing the CT imaging pore distribution spectrum, and computing the mean value and distribution variance of the calibrated electrical imaging porosity spectrum; performing standardized treatment on the mean value and distribution variance of the calibrated electrical imaging porosity spectrum to generate the standard mean value and distribution variance of porosities; forming a two-dimension plane by the standard mean value and distribution variance of porosities, wherein the standard mean value of porosities is the abscissa axis, and the standard distribution variance of porosities is the ordinate axis; and identifying the reservoir stratum type according to the two-dimension plane.

Description

technical field [0001] The invention proposes a four-quadrant reservoir type identification method and system for heterogeneous complex fracture-vug reservoirs. Background technique [0002] In the process of oil and gas exploration and development, reservoir evaluation is the comprehensive understanding and judgment of reservoir research. The purpose of research on reservoir types is to find, understand, and transform reservoirs, and give full play to the potential of reservoirs, so as to achieve the purpose of improving the benefits of exploration and development. Therefore, it is of great significance to classify reservoir types reasonably, objectively and quickly. [0003] Through research, it is found that there are many methods for identifying reservoir types, but they can be generally divided into two types: qualitative evaluation of well logging data, quantitative evaluation, and mathematical statistical classification evaluation. The qualitative and quantitative e...

AI Technical Summary

Problems solved by technology

However, the disadvantages of this method are also obvious: 1) a large number of representative sample points of known reservoir types are required, which is not suitable for the initial stage of oilfield exploration to a certain extent; 2) this method has a strong Due to regional limitations and poor applicability, it is difficult to promote and apply in different blocks; the root cause is that this method has not found the key factors that affect and restrict the division of reservoir categories

Images