Petroleum Reservoir Evaluation and Development >
2022 , Vol. 12 >Issue 1: 1 - 9
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2022.01.001
Characteristics of geological section of Well-GY8HC in Gulong Sag, Northern Songliao Basin
Received date: 2021-12-10
Online published: 2022-03-24
In order to study the lithology, property and brittleness of Gulong shale reservoir, a whole-section coring well, Well-GY8HC, is deployed in Gulong Sag. Detailed core description and element analysis show that the sedimentary microfacies in Gulong Sag are mainly semi-deep to deep lacustrine facies during the sedimentary period of Q1 to Q9 reservoirs, with thick organic-rich shale developed and can be subdivided into four types of lithology which are shale, siltstone, shell limestone and dolomite. Based on the classification principle of “structure+lithology” and combined with the lithology content characteristics, the lithofacies are divided into four types which are laminated shale, intercalated shale, massive dolomite and massive siltstone. The paleo-sedimentary environment is fresh water-brackish water+weak provenance+strong reduction in warm and humid climate, providing favorable place for organic matter formation and preservation. Comprehensive evaluation of three indexes of reservoir capacity, oil-bearing property and fracability shows that several reservoir space types of Q1 to Q3 reservoirs with good physical property, excellent oil bearing property and efficient fracability for shale oil production, being the most favorable interval for medium and high mature shale oil exploration in Daqing Oilfield.
Key words： geological section; sedimentary facies; Well-GY8HC; Gulong Sag; Sichuan Basin
Wenyuan HE , Zihui FENG , Jinyou ZHANG , Yunfeng BAI , Xiuli FU , Ying ZHAO , Xinyang CHENG , Bo GAO , Chang LIU . Characteristics of geological section of Well-GY8HC in Gulong Sag, Northern Songliao Basin[J]. Petroleum Reservoir Evaluation and Development, 2022 , 12(1) : 1 -9 . DOI: 10.13809/j.cnki.cn32-1825/te.2022.01.001
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