About This Item
- Full TextFull Text(subscription required)
- Pay-Per-View PurchasePay-Per-View
Purchase Options Explain
Share This Item
The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/12052321155
The Qiongzhusi-Dengying petroleum system in the Sichuan Basin, China
Shugen Liu,1 Bin Deng,2 Zeqi Li,3 Wei Sun,4 Juan Wu,5 Chao Luo,6 Yong Zhong,7 Xiao Liang,8 Zhiwu Li,9 Jinming Song,10 Pengda Lu,11 Tengzeng Tian,12 and Luba Jansa13
1State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
2State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
3State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
4State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
5State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
6State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
7Sichuan Geophysical Company of CNPC Chuanqing Drilling Engineering Company, Chengdu, China; [email protected]
8State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
9State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
10State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
11State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
12State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, China; [email protected]
13Geological Survey of Canada-Atlantic, Dartmouth, Nova Scotia, Canada; [email protected]
ABSTRACT
In the Sichuan Basin there is abundant evidence in the lower Cambrian Qiongzhusi Formation and Ediacaran (upper Sinian) Dengying Formation for the existence of the oldest petroleum system in China. Here, we discuss the essential elements of the petroleum system—source rock in the Qiongzhusi Formation and reservoir rock in the Dengying Formation. The source rock in the Qiongzhusi Formation was deposited in a shelf-like marine environment. More than 100 m (328 ft) of black shale was deposited in the north-south–striking Mianyang-Changning intracratonic sag. The reservoir rock is composed of dolomitic algal mound-facies in the Dengying Formation. In the outcrop, the presence of dissolution features (vugs and caverns) and geochemical results indicates freshwater karstification during early diagenesis with subsequent hydrocarbon charge. Generated hydrocarbons underwent two distinct phases of evolution from oil generation and migration during the Permian to thermal cracking to gas beginning in the Late Triassic. Thus, the oldest petroleum system in the Sichuan Basin is characterized by paleo-oil and paleogas fields and present-day gas fields, all closely controlled by the tectonic evolution of the Sichuan Basin. The development of the intracratonic sag in the basin center controlled deposition and preservation of the high-quality source rock and highly efficient hydrocarbon transformation and expulsion. The development of the Ordovician–Jurassic Leshan-Longnvsi paleouplift in the basin center focused hydrocarbon migration to charge the paleo-oil and paleogas fields. Lateral and vertical migration of hydrocarbons was facilitated along unconformities and faults in upper Sinian and lower Cambrian strata across the Sichuan Basin—in particular, the Weiyuan gas field.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
| Watermarked PDF Document: $14 | |
| Open PDF Document: $24 |
AAPG Member?
Please login with your Member username and password.
Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].