A method for quantitatively predicting favorable oil and gas exploration areas in tight sandstone
A technology for tight sandstone and oil and gas, applied in the field of quantitatively predicting favorable exploration areas for tight sandstone oil and gas, can solve problems such as misjudgment of tight sandstone oil and gas exploration and development, and achieve high operability and practicability, improve prediction accuracy, and reduce development risks. Effect
Active Publication Date: 2018-09-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
Therefore, at this stage, the evaluation method of conventional sandstone oil and gas reservoirs based on porosity and permeability is directly introduced into the evaluation and prediction of favorable exploration areas of tight sandstone oil and gas reservoirs, which may bring the risk of misjudgment to the exploration and development of tight sandstone oil and gas
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[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0024] The embodiment of the present invention provides a method for quantitatively predicting favorable exploration areas of tight sandstone oil and gas, which specifically includes the following steps:
[0025] S1: Test the porosity, permeability and oil saturation of reservoirs with different oil-bearing grades.
[0026] In this embodiment, three important parameters are obtained through the test, which lays the foundation for the subsequent method. Specifically, before the test, it is necessary to collect on-site oil test and pr...
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The invention provides a method for quantitatively predicting favorable exploration areas of tight sandstone oil and gas, which relates to the field of petroleum and natural gas exploration and development, and can promote the efficient exploration and development of tight sandstone oil and gas, specifically comprising the following steps: (1) testing the pores of reservoirs with different oil levels (2) According to the oil saturation of reservoirs with different oil grades, determine the lower limit of oil saturation of oil layers and oil-water layers; according to the porosity and permeability of reservoirs with different oil grades, Calculate the flow zone index FZI of different oil-bearing grade reservoirs; (3) determine the lower limit value of the flow zone index FZI corresponding to the favorable exploration area of tight sandstone oil and gas; (4) draw the average flow zone index FZI plane distribution map for the research horizon, Combined with the lower limit value of the flow zone index corresponding to the favorable exploration areas of tight sandstone oil and gas, the distribution law of favorable exploration areas of tight sandstone oil and gas is predicted.
Description
technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for quantitatively predicting favorable exploration areas of tight sandstone oil and gas. Background technique [0002] Tight sandstone oil and gas, as one of the main types of unconventional oil and gas resources, has made breakthroughs in exploration and development in recent years, and has become a "key field" and "bright spot type" for increasing oil and gas reserves and production. Basin found 5-10 x 10 8 Important discoveries have also been made in the Bohai Bay and Sichuan Basin in areas with t-level reserves. Tight sandstone reservoirs are often distributed over a large area and present continuous or quasi-continuous oil and gas accumulation. However, tight sandstone often undergoes complex diagenetic transformation process, resulting in poor reservoir physical properties, complex pore-throat structure and seepage characteris...
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IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 葸克来操应长刘可禹朱如凯朱宁赵一伟燕苗苗
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)