准噶尔外围低勘探程度盆地油气资源评价与勘探方向

doi:10.3969/j.issn.1672-7703.2020.06.003

摘要/Abstract

摘要： 准噶尔盆地外围分布众多中小型低勘探程度盆地，地质认识程度低、地质资料缺乏，准确分析其油气源条件和油气资源潜力对未来风险勘探具有重要意义。以地震、测井、分析化验和前人文献等资料为基础，采用低勘探程度盆地油气资源评价方法，厘定了准噶尔外围盆地主要烃源岩层位，并分析了各盆地油气资源潜力。研究表明：准噶尔外围盆地侏罗系和二叠系烃源岩为主要油源岩，其中侏罗系煤系烃源岩有机质丰度高且已达成熟阶段，具备较强的生烃能力；二叠系烃源岩为中等—好烃源岩，有机质类型为Ⅱ2—Ⅲ型，处于成熟— 高成熟阶段；石炭系和泥盆系烃源岩为主力气源岩，处于高成熟—过成熟阶段，以生气为主。采用成因法计算准噶尔外围7 个低勘探程度盆地总的石油资源量和天然气资源量分别为15009.75×104t 和339.27×108m3，总体呈“多油少气”的特征。综合油气资源评价成果，建立了侏罗系、石炭系—二叠系及泥盆系3 种有利的油气成藏模式，并优选和什托洛盖盆地与布尔津盆地为油气资源潜力大的A 类盆地，可作为下一步风险勘探地区。

关键词: 低勘探程度, 烃源岩, 油气资源评价, 勘探方向, 准噶尔盆地

Abstract: There are many relatively unexplored small-medium basins on the periphery of the Junggar Basin. Geological understanding of these basins is low, and geological data are sparse. Future risk exploration would benefit enormously from accurate analysis of the hydrocarbon source conditions in these basins and their oil and gas resource potential. This study describes the formations of main source rocks in the peripheral basins of the Junggar Basin and estimates the oil and gas resource potential of each basin. The study is based on seismic data, well logging, laboratory testing, and previous literatures. The method for basins with low levels of exploration is used for oil and gas resource assessment. The results show that Jurassic and Permian source rocks are the main oil source rocks in these basins. The organic matter abundance of the Jurassic coal-measure source rocks is high, with the rocks having reached the mature stage and having strong hydrocarbon generation capacity. The Permian source rocks are medium to good, the organic matter type is Ⅱ2-Ⅲ, and the source rocks are in the mature to high-mature stage. The Carboniferous and Devonian source rocks are the main gas source rocks. They are in the high- to over-mature stage and are gas-prone. Using the genetic method, the calculated total oil and gas resources of seven low-exploration basins on the periphery of the Junggar Basin are 15009.75×104 t and 339.27×108 m3, respectively, characterized as “more oil and less gas”. Based on this assessment, three favorable hydrocarbon accumulation models—for the Jurassic, the Carboniferous-Permian, and the Devonian—are established. The Heshituoluogai and Buerjin basins are identified as Type A basins with great oil and gas resource potential and considered to be the most promising areas for risk exploration.

中图分类号:

冯德浩, 刘成林, 姜文利, 高煖, 李培, 黎彬, 柳永军, 张蔚. 准噶尔外围低勘探程度盆地油气资源评价与勘探方向[J]. 中国石油勘探, 2020, 25(6): 26-38.

Feng Dehao, Liu Chenglin, Jiang Wenli, Gao Xuan, Li Pei, Li Bin, Liu Yongjun, Zhang Wei. Oil and gas resource assessment of basins with low levels of exploration on the periphery of the Junggar Basin and identification of exploration targets[J]. China Petroleum Exploration, 2020, 25(6): 26-38.

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