Petroleum Exploration Domains and Favorable Directions of the Lower Marine Assemblage in Eastern Sichuan Basin

doi:10.19657/j.geoscience.1000-8527.2021.041

Abstract

Abstract:

Sichuan Basin is a large superimposed petroliferous basin with great resource potential, which has experienced multi-stage extensional-compressional cycle. Few substantial gas exploration discoveries have been obtained so far in eastern Sichuan Basin while a series of natural gas exploration discoveries have been obtained in Dengying formation of the Upper Sinian system and Longwangmiao Formation of the Lower Cambrian system in recent years in the middle basin. By analysis of tectonic and sedimentary evolution, three evolutionary stages were built up from the Sinian period to the Silurian period in the eastern Sichuan basin and its adjacent areas: (1) extensional differentiation platform stage (from Sinian period to the Canglangpu phase of Early Cambrian period), (2) stable unified platform stage (from the Longwangmiao phase of Early Cambrian period to the Baota phase of the Middle Ordovician period), and (3) compressional foreland depression stage (Late Ordovician period to Silurian period). According to the comprehensive analysis of petroleum geological elements and the characteristics of hydrocarbon migration and accumulation, three hydrocarbon exploration domains are recognized, which are (1) pre-salt carbonate exploration domain (Sinian system to Gaotai Formation of the Middle Cambrian system), (2) post-salt carbonate exploration domain (Xixiangchi group of Middle-Upper Cambrian system to Baota Formation-Linxiang Formation of Middle-Upper Ordovician), and (3) tight clastic rock exploration domain (Upper Ordovician to Silurian system) from lower to upper, respectively. There exists major differences in the aspects of petroleum geological elements, characteristics of migration and accumulation of hydrocarbon, and main controlling factors, and therefore the key constraints of petroleum exploration are different in different exploration domains. By systematic evaluation of the exploration domains, it is pointed out that the carbonate platform marginal zone of the fourth member of the Dengying Formation in southeastern Sichuan basin, the carbonate shallow bank of the Cambrian Xixiangchi Group, and the large delta sand body of the Xiaoheba Formation of the Silurian system, etc. are favorable exploration directions and key breakthrough areas in the eastern Sichuan Basin.

Key words: exploration domain, favorable exploration direction, sedimento-tectonic evolution, eastern Sichuan Basin

CLC Number:

TE132

SUN Ziming, ZHANG Rongqiang, SUN Wei, HAO Yunqing, BIAN Changrong. Petroleum Exploration Domains and Favorable Directions of the Lower Marine Assemblage in Eastern Sichuan Basin[J]. Geoscience, 2021, 35(03): 798-806.

Figures/Tables 6

Fig.1 Schematic sections illustrating the tectonic-sedimentary evolutionary stages of the Lower Marine Assemblage in eastern Sichuan Basin

Fig.2 Petroleum exploration domains of the Lower Marine Assemblage in eastern Sichuan Basin

Fig.3 Comprehensive pattern of migration and accumulation of hydrocarbon of the Lower Marine Assemblage in eastern Sichuan Basin

Fig.4 Interpreted seismic section in the eastern Sichuan Basin(flattened along the top of the second member of Dengying Formation,for location, see the A-A’ inFig.5)

Fig.5 Favorable exploration areas for hydrocarbon of the Lower Marine Assemblage in eastern Sichuan basin

Fig.6 Section showing natural gas migration and accumulation of the Dongshan anticlinal structure in eastern Sichuan basin(for location, see the B-B' in Fig.5)

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