| 摘要: |
| 藏北羌塘盆地历经石油部门和地调部门25年的地质调查和石油勘探，因为迄今没有发现工业油气藏，目前对其勘探前景和勘探目标的认识争议很大。本文试图根据地表和浅钻发现的优质烃源岩和含油白云岩的分布，对下一步圈定富烃凹陷位置和聚焦勘探目标提出一些认识。研究表明：（1）根据油气勘探的源控论思路，以毕洛错和西长梁等地的侏罗系海湾或台沟相油页岩沉积为标识，根据地震勘探划分的构造单元，首先优选富烃凹陷；（2）同时，参考双湖地区隆鄂尼、昂达尔和鄂斯玛等地地表出露的布曲组白云岩油层，开展地震攻关，引进中国南方白云岩储层勘探的经验和方法，标定南羌塘和北羌塘坳陷区白云岩的空间分布，以白云岩作为重点勘探目标，力争实现羌塘盆地油气勘探的战略突破。 |
| 关键词: 优质烃源岩 地层层位 生烃凹陷 白云岩储集层 时空分布 羌塘盆地 |
| DOI：10.19826/j.cnki.1009-3850.2022.04005 |
| 附件 |
| 投稿时间：2021-12-06修订日期：2022-03-28 |
| 基金项目: |
|
| Stratigraphic position of high-quality source rocks and distribution of oil-bearing dolomites in the Qiangtang Basin |
| YI Haisheng, XIA Guoqing |
| (Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China) |
| Abstract: |
| The geological investigation and petroleum exploration in the Qiangtang Basin, northern Tibet have been taken for about 25 years, but the commercial reservoirs are not found and the exploration targets and prospects are in debate. This paper focuses on the distributions of high quality source rocks and oil-bearing dolomites in the outcrops and drills in order to discuss the hydrocarbon-rich depressions and exploration targets. Basing on the theories of petroleum explorations, we have studied the marine Jurassic oil shales of Biluocuo and Xichangliang and structural units gotten from the seismic exploration and have chosen the hydrocarbon-rich depressions. Using the oil-bearing dolomites of the Buqu Formation in the Longeni, Angdaercuo and Emasi as the marker horizon and referring the dolomite reservoirs in southern China, we have suggested the spatial distribution of dolomites which are probably the main exploration targets for the strategic breakthrough of oil exploration in northern and southern depressions of the Qiangtang Basin. |
| Key words: high-quality source rocks stratigraphic horizons hydrocarbon generation depression excellent dolomite reservoirs Temporal and Spatial distribution Qiangtang Basin |
