Source rock evaluation and enrichment conditions of shale oil for Lucaogou Formation in Jimsar sag
Qiu Zhen1,2, Tao Huifei3, Lu Bin2, Wu Xiaozhi1, Yang Zhi1, Tang Yong4, Cui Jingwei1, Zhou Jie2
1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083;
2. Langfang Branch, PetroChina Exploration and Development Research Institute, Langfang, Hebei 065007;
3. Key Laboratory of Petroleum Resources Resource Research, Institute of Geology and Geophysiscs, Chinese Academy of Sciences, Lanzhou 730000;
4. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000
The source rocks of Lucaogou Formation in Jimusar sag, Junggar Basin is a set of excellent continental hydrocarbon source rock, and is also one of the hotspots of the shale oil and gas research in China. On the basis the examination of 580 meters of 18 well cores, observation of thin sections and organic geochemistry analysis, the rocks types and organic geochemistry characteristics of the source rocks were comprehensively studied. The results reflected that: 1)On the whole, the hydrocarbon source rocks of the Lucaogou Formation were high quality source rock, whose kerogen were mainly Ⅰ~Ⅱ types, and were at the stage of low maturity to maturity; 2)The source rocks could mainly be classified into five rock types: pure shale, dolomitic shale, pure mudstone, dolomitic mudstone and silty mudstone. Through comprehensive study, the organic carbon content limit value of the high quality and effective source rock of the Lucaogou Formation hydrocarbon source rocks was 2.0%. Meanwhile, the hydrocarbon source rocks with TOC≥2.0% were also the favorable layers for shale oil in the Jimusar sag.