Petroleum geological conditions and exploration importance of Proterozoic to Cambrian in China

ZHAO Wenzhi; HU Suyun; WANG Zecheng; ZHANG Shuichang; WANG Tongshan

doi:10.11698/PED.2018.01.01

Petroleum Exploration and Development >

2018 , Vol. 45 >Issue 1: 1 - 13

DOI: https://doi.org/10.11698/PED.2018.01.01

PETROLEUM EXPLORATION

Petroleum geological conditions and exploration importance of Proterozoic to Cambrian in China

ZHAO Wenzhi ,
HU Suyun ,
WANG Zecheng ,
ZHANG Shuichang ,
WANG Tongshan

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PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received date: 2017-08-04

Revised date: 2017-10-17

Online published: 2017-12-07

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Abstract

The discovery of the giant Anyue gas field in Sichuan Basin gives petroleum explorers confidence to find oil and gas in Proterozoic to Cambrian. Based on the reconstruction of tectonic setting and the analysis of major geological events in Mesoproterozoic-Neoproterozoic, the petroleum geological conditions of Proterozoic to Cambrian is discussed in this paper from three aspects, i.e. source rocks, reservoir conditions, and the type and efficiency of play. It is found that lower organisms boomed in the interglacial epoch from Mesoproterozoic-Neoproterozoic to Eopaleozoic when the organic matters concentrated and high quality source rocks formed. Sinian-Cambrian microbial rock and grain-stone banks overlapped with multiple-period constructive digenesis may form large-scale reservoir rocks. However, because of the anoxic event and weak weathering effect in Eopaleozoic-Mesoproterozoic, the reservoirs are generally poor in quality, and only the reservoirs that suffered weathering and leaching may have the opportunity to form dissolution-reconstructed reservoirs. There are large rifts formed during Mesoproterozoic-Neoproterozoic in Huabei Craton, Yangtze Craton, and Tarim Craton in China, and definitely source rocks in the rifts, while whether there are favorite source-reservoir plays depends on circumstance. The existence of Sinian-Cambrian effective play has been proved in Upper Yangtze area. The effectiveness of source-reservoir plays in Huabei area depends on two factors: (1) the effectiveness of secondary play formed by Proterozoic source rock and Paleozoic, Mesozoic, Cenozoic reservoir rocks; (2) the matching between reservoirs formed by reconstruction from Mesoproterozoic- Neoproterozoic to Eopaleozoic and the inner hydrocarbon kitchens with late hydrocarbon generation. As for Tarim Basin, the time of Proterozoic and the original basin should be analyzed before the evaluation of the effective play. To sum up, Proterozoic to Cambrian in the three craton basins in China is a potential exploration formation, which deserves further investigation and research.

Key words： Proterozoic; Cambrian; tectonic setting; major geological events; interglacial epoch; source rock; microbial rock; intracratonic rift; play

Cite this article

ZHAO Wenzhi , HU Suyun , WANG Zecheng , ZHANG Shuichang , WANG Tongshan . Petroleum geological conditions and exploration importance of Proterozoic to Cambrian in China[J]. Petroleum Exploration and Development, 2018 , 45(1) : 1 -13 . DOI: 10.11698/PED.2018.01.01

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