A fine division method for deep/ultra-deep carbonate sedimentary microfacies based on lithoelectric interpretation model

Abstract

The present invention proposes a method for finely dividing the sedimentary microfacies of deep / ultra-deep carbonate rocks based on a lithoelectric interpretation model. Classification, performing characteristic curve fusion processing on logging curves through principal component analysis, extracting characteristic curves of different rock types, and establishing rock-electrical interpretation models, so as to realize the identification and calibration of deep / ultra-deep carbonate rock types ; analysis of the vertical and horizontal development laws and superimposed relationships of rock types, determine the regional sedimentary model, and then finely divide the sedimentary microfacies of different rock types, and further restore the sea level change curve. The invention can not only improve the precision of sedimentary microfacies division and ensure the accuracy of geological information, but also improve the understanding of sedimentary facies, provide support for actual exploration deployment decisions, and further reduce exploration risks and investment in exploration costs.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, and particularly relates to a method for finely dividing deep / ultra-deep carbonate sedimentary microfacies based on a petroelectric interpretation model. Background technique [0002] According to the international common methods and drilling engineering specifications [buried depth ≥ 15000ft (4500m)], and my country's "oil and gas reserves calculation specification" (buried depth ≥ 3500m), and combined with the actual exploration and development work, the depth of 4500m in the western region (more than 6000m is Ultra-deep layers) and 3,500m deep in the eastern region (more than 4,500m are ultra-deep layers), which are defined as the occurrence areas of deep oil and gas resources. [0003] In recent years, domestic oil and gas exploration in deep / ultra-deep carbonate formations has successively made major discoveries in the Tarim, Ordos, Sichuan and other basins. Oil...

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Problems solved by technology

However, due to the early formation of deep / ultra-deep carbonate formations, several tectonic movements, and special environments such as high temperature and high pressure, the research on the division of sedimentary microfacies of deep / ultra-deep carbonate rocks is relatively sluggish, and There is a lot of controversy over the existing results, which not only affects the understanding of the genetic mechanism of deep / ultra-deep carbonate reservoirs, but also restricts the progress of oil and gas exploration

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