Petroleumgeological achievements and exploration significance of the first oil and gas scientific drilling well in the Qiangtang Basin

FU Xiu-gen; WANG Jian; SONG Chun-yan; LIU Zhong-rong

doi:10.19826/j.cnki.1009-3850(2020)01-0015-10

Sedimentary Geology and Tethyan Geology > 2020 > 40(1): 15-25. > DOI: 10.19826/j.cnki.1009-3850(2020)01-0015-10

FU Xiu-gen, WANG Jian, SONG Chun-yan, LIU Zhong-rong. Petroleumgeological achievements and exploration significance of the first oil and gas scientific drilling well in the Qiangtang Basin[J]. Sedimentary Geology and Tethyan Geology, 2020, 40(1): 15-25. DOI: 10.19826/j.cnki.1009-3850(2020)01-0015-10

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Petroleumgeological achievements and exploration significance of the first oil and gas scientific drilling well in the Qiangtang Basin

1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
2. Chengdu Center, China Geological Survey, Chengdu 610081, China;
3. Sinopec exploration company, Chengdu 610041, China

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Received Date: October 10, 2019
Revised Date: January 04, 2020
Published Date: March 29, 2020

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Abstract

Abstract

The Qiangtang Basin is located in central Qinghai-Tibet Plateau, which is a new oil and gas exploration area with the largest area and the lowest level of exploration in China. Oil and gas geological conditions are unclear in this basin due to lack of validation of oil and gas scientific drilling wells. Recently, QTKT1 well was drilled by Chengdu Center, China Geological Survey in the Northern Qiangtang Depression with a depth of 4696.18 m. This paper reports the petroleum geological achievements of the well. The Quemo Co Formation conformably overlies the Upper Triassic Nadi Kangri Formation in the Badao Lake area suggesting an early-middle Jurassic age. Mudstones and gypsum were well developed in the Quemo Co Formation, suggesting delta-restricted platform environments. The QTKT1 well penetrated the Quemo Co Formation source rocks firstly, although they are poor source rocks. Shoal on edge of platform was identified on the southwest of the QTKT1 well with an area of 42.4 km², where is a favorable target for oil and gas exploration in the future. Thirteen gas logging abnormal zones and two important regional caps were identified in the QTKT1 well. These data suggest that the Bandao Lake area exhibit good oil and gas preservation conditions and is a favorable area for oil and gas exploration in the basin.
- Oil and gas conditions,
- scientific drilling well,
- Qiangtang Basin,
- Seismic interpretation

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