The Source Rock and Its Palaeo-environment of Lucaogou Formation, Permian in Santanghu Basin

FENG Qiao; LIU Yi-qun; HAO Jian-rong

The middle Permian Lucaogou Fm. was distributed within Malang sag and the southwestern part of Tiaohu sag. It was the main source rock composed from carbonate rocks and dark shale. Lucaogou Fm. was deposited in the paleao-environment from saltwater to half-saltwater based on carbonate rocks, gammacerane index (GI) and carbon isotopes of crude oils. Its depositional center, located on the eastern side of the southwest thrust structure belt, extended along the northwest-southeast direction and paralleled to the regional structural range. The prototype basin's scope of Lucaogou Fm. was greater than present. In particular, its southwest boundary should be out of the Lucaogou Fm. basin. Santanghu basin was separated reciprocally with Tu-Ha basin and Junggar basin based on the variations of carbonate rock's thickness and gammacerane index during Lucaogou Fm. sedimentation.

1. Shangdong Science and Technology University Tai'an Shangdong 271019;

2. The State Key Laboratory of Organic Geochemistry, Chinese Academy of Sciences,Guangzhou 510640;

3. Northwest University, Xi'an 710069

Received Date: 2003-09-20

Rev Recd Date: 2003-12-04

Publish Date: 2004-09-10

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Abstract: The middle Permian Lucaogou Fm. was distributed within Malang sag and the southwestern part of Tiaohu sag. It was the main source rock composed from carbonate rocks and dark shale. Lucaogou Fm. was deposited in the paleao-environment from saltwater to half-saltwater based on carbonate rocks, gammacerane index (GI) and carbon isotopes of crude oils. Its depositional center, located on the eastern side of the southwest thrust structure belt, extended along the northwest-southeast direction and paralleled to the regional structural range. The prototype basin's scope of Lucaogou Fm. was greater than present. In particular, its southwest boundary should be out of the Lucaogou Fm. basin. Santanghu basin was separated reciprocally with Tu-Ha basin and Junggar basin based on the variations of carbonate rock's thickness and gammacerane index during Lucaogou Fm. sedimentation.

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Reference (6)

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The Source Rock and Its Palaeo-environment of Lucaogou Formation, Permian in Santanghu Basin

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