Prediction method of tight sandstone reservoir pressure

Abstract

The invention relates to a prediction method of tight sandstone reservoir pressure. The prediction method comprises the following steps: comprehensively comparing an interval transit time well log, aresistivity well log, a density well log and a compensated neutron well log of a single well, and according to the synchronous change trend segment of the interval transit time well log, the resistivity well log, the density well log and the compensated neutron well log, determining the normal compaction segment of a stratum; using the interval transit time well logs corresponding to the normal compaction segments of multiple wells in the same region to establish a comprehensive normal compaction trend line equation; and obtaining an equivalent depth He according to the comprehensive normal compaction trend line equation, and then substituting into a calculation formula of an equivalent depth method to obtain the stratum pressure of a target point. By comprehensively comparing the synchronous change trend of the well logs, the normal compaction segment with high reliability can be determined. The comprehensive normal compaction trend line equation established based on the method has higher credibility and persuasion, thereby greatly reducing the error of predicting the stratum pressure by using the equivalent depth method.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a method for predicting the pressure of tight sandstone reservoirs. Background technique [0002] As global oil and gas exploration advances towards unconventional oil and gas resources, more and more tight sandstone reservoirs have been discovered. They are all abnormally high-pressure oil and gas reservoirs, which to a certain extent increase the difficulty of mining such oil and gas reservoirs. Therefore, finding a suitable pressure prediction method has important guiding significance for the safe and efficient development of such oil and gas reservoirs. However, although there are many methods and models for formation pressure prediction in the prior art, due to the geological complexity of tight sandstone reservoirs, the prediction of tight sandstone reservoir pressure has the problem of large errors. Therefore, there is an urgent need for an accurate prediction metho...

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Problems solved by technology

However, although there are many methods and models for formation pressure prediction in the prior art, due to the geological complexity of tight sandstone reservoirs, there are problems with large errors in the prediction of tight sandstone reservoir pressure.

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