A method for predicting the development and distribution of lacustrine high-quality source rocks

Abstract

The invention provides a prediction method of development distribution of lacustrine high-quality source rock. The method comprises the following steps of by aiming at a main source layer section of atargeted region, (1) respectively recovering an ancient lake mode; (2) respectively defining the shallow lake and semi-deep lake-deep lake distribution range on the basis of deposition and / or sedimentation center, paleo-water-depth distribution and wave base depth; (3) respectively dividing each single well deposition organic phase type on the basis of deposition environment, the ancient lake mode, the organic matter abundance and the organic matter type, and then defining the plane distribution range of advantageous facies; (4) respectively determining a vertical distribution range of the high-quality source rock by using logging data; (5) respectively determining the transverse distribution change of the high-quality source rock by using earthquake data; and (6) respectively drawing development distribution patterns of the high-quality source rock on the basis of the advantageous facies plane distribution range, the high-quality source rock vertical distribution range and the high-quality source rock transverse distribution change. Therefore the concrete distribution of the lacustrine high-quality source rock of the target region, namely the prediction result of the lacustrine high-quality source rock can be obtained.

Description

technical field [0001] The invention belongs to the field of hydrocarbon-rich depression exploration, and relates to a method for predicting the development and distribution of lacustrine high-quality hydrocarbon source rocks. Background technique [0002] Petroleum-bearing basins generally have multiple sedimentary sags, but oil and gas mainly come from a few hydrocarbon-generating sags (or troughs) with extremely rich oil and gas resources, which are called hydrocarbon-rich sags (or troughs). Oil and gas exploration at home and abroad shows that the spatial distribution of oil and gas resources has the characteristics of extremely disparity between rich and poor. Nearly 2 / 3 of the world's proven conventional oil and gas reserves are in the Persian Gulf Basin, and about 1 / 3 of the natural gas is distributed in Russia ( Liu Chiyang. The distribution of mineral resources is extremely rich: the "28th rule" in nature [J]. Acta Geologica Sinica, 2013, 87 (Supplement): 187). Dom...

AI Technical Summary

Problems solved by technology

However, while predicting the distribution of high-quality source rocks, previous researchers rarely considered the paleoenvironmental characteristics of continental lake basins during the development period of high-quality source rocks and the distribution of sedimentary organic facies that were favorable for the development of high-quality source rocks. In well logging or seismic evaluation methods, the uncertainty brought about by differences in structural and sedimentary environments is ignored, which makes it difficult to understand the thickness and distribution range of high-quality source rocks in different structural units

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