Издательство СО РАН

Издательство СО РАН

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Поиск по журналу

Геология и геофизика

Принятые к публикации статьи

SUPERIMPOSED PATTERN OF THE SOUTHERN SICHUAN BASIN REVEALED BY SEISMIC REFLECTION PROFILES ACROSS LUSHAN-CHISHUI, CHINA

Guiping Su1,2, Zhongquan Li1,2, Hongkui Li1,2, Danlin Ying3, Gen Li1,2, Xiao Ding1,2, Xingwang Tian3, Henglin Liu1,2
1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology), Chengdu, 610059, Sichuan,P.R.China
2 Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Land and Resources(Chengdu University of Technology),Chengdu, 610059, Sichuan,P.R.China
3 Research Institute of Exploration and Development, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610041, China
Ключевые слова: Southern Sichuan basin; Seismic reflection profiles; Prototype basin; Superimposed pattern

Аннотация

Sichuan Basin is a kind of typical intra-craton superimposed basin and rich in oil and gas resources in the different sets of sedimentary sequences. It had undergone multi-stage tectonic evolutions which resulted in different types of prototype basins. However, there are still many different opinions on the types and superimposed patterns of Sichuan Basin in different geological periods, which largely affect the understanding of the effective accumulation and preservation mechanism of oil and gas. This paper aims to re-recognize several prototype types of Sichuan Basin by discussing the prototype basin and their superimposed models, so as to further deepen the significance of basin superimposed evolution to hydrocarbon accumulation. By using the regional geological data and drilling data , seismic reflection profiles arcoss Lushan-Chishui are interpreted in detail, and then five regional unconformities are identified with an equilibrium profiles technique which is used to flatten the formation interface in different geological periods. According to the unconformities,the southern Sichuan basin is divided into six tectonic layers. Each tectonic layer is considered as a prototype basin, respectively, they are Pre-Sinian Crystal basement (AnZ), marine rift cratonic basin (Z-S), marine intracratonic sag basin (P2l-T2l), marine-continental downfaulted basin (T3x1-T3x3), continental depression basin (T3x4-J) and foreland basin (K-Q). The different prototype basins are vertically superimposed to form "layered block" geological structure of the multi-cycle basins. Affected by the late stage tectonic transformation, the geological structure of vertical stratification underwent a strong transformation, which had a profound impact on oil and gas accumulation with a characteristics of early accumulation and late adjustment.

DOI: 10.15372/GiG2020126