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Method for recovering original sedimentary appearance of strike-slip transformation basin

A kind of basin and original technology, applied in the field of original basin restoration, can solve the problems of incomplete remnants, spatial dislocation, recognition of basin prototype, objective evaluation of its resource potential and scale obstacles, and achieve the effect of improving research level and oil and gas exploration effectiveness

Active Publication Date: 2021-06-15
NORTHWEST UNIV +1
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Problems solved by technology

[0003] Strike-slip reformed basins refer to basins reformed by strike-slip fault activities in the geological history period. The reform results of such basins often manifest as spatial dislocation and incomplete remnants. It is very important to understand the prototype of the basin and objectively evaluate its resource potential and scale. cause serious hindrance

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  • Method for recovering original sedimentary appearance of strike-slip transformation basin
  • Method for recovering original sedimentary appearance of strike-slip transformation basin
  • Method for recovering original sedimentary appearance of strike-slip transformation basin

Examples

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Embodiment

[0098] Example, Restoration of the Jurassic Basin in the Western Qaidam Basin-Altyn Region

[0099] Geological overview

[0100] The Qaidam Basin is located in the northeast of the Qinghai-Tibet Plateau, bordering the East Kunlun Mountains in the south, the South Qilian Mountains in the north, and the Tarim Basin in the west with the Altun Mountains ( Figure 7 ), with an area of ​​about 12.1×10 4 km 2 . The basement of the basin is complex, with double basement of pre-Sinian crystalline rocks and Sinian-Triassic non-metamorphic-hypermetamorphic rocks. The basement in some parts of the central and western regions was intruded and reformed by Caledonian and Hercynian magmatic rocks.

[0101] The Altyn structural belt is sandwiched between the Qaidam Basin and the Tarim Basin, and consists of multiple structural units formed in different periods. The Aktashtage complex composed of Milan Group, TTG gneiss and Paleoproterozoic intrusive rocks is widely exposed in the Abei Bloc...

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Abstract

A method for recovering an original sedimentary appearance of a strike-slip transformation basin comprises the following steps of: (1) determining the strike-slip transformation basin, determining whether a sedimentary body associated with strike-slip fracture at present is subjected to strike-slip fault dislocation transformation or not, and further determining and identifying from three aspects; for the basin subjected to strike-slip transformation, (2) analyzing the stratigraphic deposition relation in the same period and (3) analyzing the material-source relation in sequence, wherein the distribution pattern of paleocurrent and high-precision chipping zircon source tracing can indicate whether each residual basin has a common source region and a possible source region position or not; and (4) on the basis of analysis in the three steps, carrying out dislocation distance estimation and original sedimentary appearance recovery on stratums at the same time on the two sides of a strike-slip fault. Objective recovery of the original sedimentary appearance is a basis for objectively knowing the paleo-geographical appearance and the basin-mountain paleo-structure pattern in the geologic history period, and is also a basis for scientifically evaluating oil and gas resources and efficiently exploring and deploying, so that the research significance of the method is very important.

Description

technical field [0001] The invention belongs to the technical field of restoring original basins, and in particular relates to a method for restoring the original sedimentary features of strike-slip reformed basins. Background technique [0002] A sedimentary basin ("basin" for short) is an area where structural subsidence occurs on the earth's surface and sedimentary filling is formed. Basins are places where oil, gas, coal and other energy minerals gather. As a sedimentary entity with a specific spatial distribution formed in the geological history, a basin often suffers from different degrees of transformation and damage after its formation. The older the age, the stronger the transformation. Since the Mesozoic-Cenozoic, influenced by the activities of multiple tectonic domains in the coastal Pacific Ocean, Siberia and Himalaya, the sedimentary basins in China have the remarkable characteristics of strong activity and strong later transformation. For basins that have un...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00G01V99/00
CPCG01V11/00G01V99/00
Inventor 赵俊峰王晓梅黄雷赵旭东李旋李一凡
Owner NORTHWEST UNIV
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