Method for determining most favorable range of oil-gas reservoir distribution of continental down-faulted basin

Abstract

The invention provides a method for determining a most favorable range of oil-gas reservoir distribution of a continental down-faulted basin. According to the method, at least one hydrocarbon potential index (S1+S2) / TOC is searched for a specific source rock area and statistic analyzing is carried out on the at least one hydrocarbon potential index (S1+S2) / TOC and a hydrocarbon expulsion threshold Z0 and a hydrocarbon expulsion rate qe are determined; a hydrocarbon expulsion strength Eq of the source rock is calculated; a distance parameter of entrapment to the center of the hydrocarbon expulsion strength and a distance parameter of entrapment to a hydrocarbon expulsion boundary are determined; and a most favorable range of petroleum distribution is determined by utilizing the determined distance parameters. According to the invention, a difficult problem of quantification of oil-gas distribution range prediction under the source control oil-gas effect can be solved and an important technical support is provided for the most favorable range prediction of oil-gas reservoir distribution and the current oil-gas exploration guiding can be provided.

Description

technical field [0001] The invention relates to the field of formation and distribution prediction of oil and gas pools, in particular to a method for determining the most favorable distribution range of oil and gas pools in continental faulted basins. Background technique [0002] The most favorable range of oil and gas reservoir distribution has always been a hot topic of controversy among scholars. Hu Chaoyuan put forward the idea of ​​"source control theory" on page 9 of the second issue of "Acta Petroleum Sinica" in 1982. Through the statistics of the discovered oil and gas fields, he pointed out that the oil-generating area controls the distribution of oil-gas reservoirs, that is, the oil-gas reservoirs surround the oil-generating The area presents a ring-shaped distribution. Li Desheng pointed out that the distribution of oil and gas in the Bohai Bay Basin is also controlled by oil-generating sags in "Marine Geology Research", Volume 1, Issue 1, Page 15, 1981. Schol...

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Problems solved by technology

Because people can only look for exploration targets in a certain range of hydrocarbon-generating sags based on this idea, but it is impossible to know which targets are the most favorable and which ranges have the most oil and gas reservoirs.

Moreover, previous studies were all based on statistical analysis without establishing a quantitative prediction model, resulting in low prediction accuracy, poor operability, and high risks in oil and gas exploration.

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