Method for unconventional oil and gas favorable exploration area of tidal plateau deposition system of Shanxi group in Zhoukou depression and peripheral region

Abstract

The invention discloses a method for predicting an unconventional oil and gas favorable exploration area of a tidal plateau deposition system of Shanxi group in Zhoukou depressionand a peripheral region. The method provided by the invention comprises the following steps: identifying a deposition system and at least one key interface of the deposition system by using basic data corresponding to a research area, the key interface comprising a sequence interface and / or a maximum generic surface; identifying at least one reverse fault and a reverse fault footwall stratum corresponding to the at least one key interface through basic data and a structure identification technology; and performing stratigraphic comparison on the reverse fault footwall stratum and the three-level sequence corresponding to the adjacent drilling well, and determining the development condition of the reverse fault footwall in-situ deposition system, so as to obtain a favorable oil-gas exploration strata series in the research area. The structure recognition technology is used for in-situ deposition system recognition, and oil and gas excavation is facilitated.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method for predicting unconventional oil and gas favorable exploration areas of the Shanxi Formation tidal flat sedimentary system in the Zhoukou Depression and surrounding areas. Background technique [0002] The Zhoukou Depression is located in the middle of the South North China Basin in the southeastern part of the North China Plate (platform), and is a first-order structural unit with an area of ​​about 32,600 km 2 . The research area is located in the east of the Zhoukou Depression. Exploration work began in 1951. According to incomplete statistics, there are currently 22 wells drilled in the study area, with a total footage of 71,749 m. Among them, 6 wells have revealed a relatively complete Upper Paleozoic, and 13 wells have been drilled. Oil and gas shows have been seen in the Cenozoic, Mesozoic and Paleozoic wells, revealing its oil and gas exploratio...

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Problems solved by technology

[0003] Previous studies have discussed the Mesozoic tectonic evolution characteristics, sedimentary facies, sedimentary models, reservoirs, and hydrocarbon sources in the southern Zhoukou Depression. Study on the sedimentary characteristics of the Permian, Carboniferous or Permian as a whole cannot meet the needs of exploration

[0004] However, the Zhoukou Depression lacks the sequence stratigraphic framework division of a certain stratigraphic unit (group, segment) and the study of the sedimentary characteristics within the sequence stratigraphic framework, resulting in unclear spatial distribution characteristics of the sedimentary system in the study area

In addition, the structure of the study area is complex, and the accumulation model composed of the burial model, hydrocarbon generation history and hydrocarbon expulsion history is still uncertain.

In the area where the primary stratum of the sedimentary system is well developed, the later period suffered from relatively strong tectonic movement, which destroyed the previously deposited favorable exploration strata, which restricted the selection of favorable exploration areas in the field of oil and gas exploration in the study area

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