Lacustrine-facies dense shell limestone relatively-high-quality reservoir identification method

Abstract

The invention provides a lacustrine-facies dense shell limestone relatively-high-quality reservoir identification method. The method comprises the following steps: obtaining static data and dynamic data related to a cored interval; according to the static data, carrying out sedimentary microfacies division on the cored interval and determining favorable sedimentary microfacies and development position of shell limestone reservoir development; on the basis of the determined favorable sedimentary microfacies and development position of shell limestone reservoir development, determining a well section and position of relatively-high-quality reservoir development in shell limestone reservoir with the dynamic data being combined; according to a log curve of the determined well section of the relatively-high-quality reservoir development in the shell limestone reservoir, establishing electric standard of the relatively-high-quality reservoir in the shell limestone reservoir; and according to the electrical characteristic of drilled wells in the region and the electric standard, finding the distribution range of the relatively-high-quality reservoir in the region. The method can effectively and accurately identify the relatively-high-quality reservoir in the lacustrine-facies dense shell limestone region.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for identifying relatively high-quality reservoirs of lacustrine tight shell limestone. Background technique [0002] After more than half a century of exploration and development of Jurassic crude oil in the Sichuan Basin, good exploration and development results have been achieved. Five sets of oil-bearing formations have been discovered vertically, five oil fields have been proven, and the proven reserves of crude oil have reached more than 80 million yuan. Among them, the accumulatively proven lacustrine tight oil in the Da'anzhai section exceeds 70 million tons, and the cumulative crude oil production exceeds 4 million tons, accounting for more than 80% of the cumulative Jurassic crude oil production. The exploration and development effect is remarkable. [0003] The "four times" resource evaluation shows that the total tight oil resources of the fiv...

AI Technical Summary

Problems solved by technology

For the tight shell limestone of the Jurassic Da’anzhai Member in the Sichuan Basin, how to identify relatively high-quality reservoirs has become a technical bottleneck that needs to be solved urgently. At present, there is no effective identification of relatively high-quality reservoirs suitable for lacustrine tight shell limestones. method

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