Discovery of oil-bearing dolomite in Dazhuoma area of Qiangtang Basin and its significance
-
摘要:
白云岩作为含油气盆地最重要的储层, 长期以来一直是盆地油气评价和勘探的重点。报道近期在南羌塘安多地区达卓玛地区发现的含油白云岩地质特征。白云岩出露于中侏罗世布曲组, 厚度大于30m, 横向延伸大于80m, 岩石类型为中-粗晶白云岩, 其孔隙度在5.0%~17.0%之间, 渗透率在2.84×10-3~236×10-3μm2之间, 属于低孔低渗至中孔低渗储层, 与已发现的隆鄂尼优质白云岩相似, 是盆地良好的储集层。空间上, 达卓玛白云岩位于隆鄂尼-昂达尔错白云岩东部, 且处于同一层位, 表明白云岩在南羌塘盆地东西展布约180km。达卓玛含油白云岩的发现扩大了羌塘盆地白云岩储层和古油藏带的范围和规模, 为羌塘盆地油气地质评价和勘探部署提供了新的依据。
Abstract:The dolomite serves as the most important reservoir which has always been the key to the evaluation and exploration of oil and gas. The oil-bearing dolomite was found recently near the Dazhuoma area, Amdo. The oil-bearing dolomite develops in the Buqu Formation of Middle Jurassic with the thickness over 30m and the length over 80m. The rocks are the medium-coarse-grain dolomite. The porosity of the samples is in the range of 5%~17% and the permeability is from 2.84×10-3μm2 to 236×10-3μm2. The dolomite belongs to the low-porosity and low-permeability to medium-porosity and low-permeability reservoir which is similar to the high quality dolomite of Longeni. The new oil-bearing dolomite found in Amdo lies in the same layer as the dolomite in the Bi-luo Co-Angdaer Co zone, from which the authors infer that the oil-bearing dolomite has an east-west distribution for about 180km and is the most important reservoir in the basin. The discovery of oil-bearing dolomite in Dazhuoma area expands the distribution and extent of dolomite reservoir, which can provide new basis for the oil exploration and disposition in Qiangtang Basin.
-
Keywords:
- oil-bearing dolomite /
- Dazhuoma area /
- reservoir /
- Qiangtang Basin
-
致谢: 中国地质大学（北京）张佳玮博士在样品处理分析过程中给予的帮助，周敖日格勒博士对本文提出建议，以及硕士生王博、左鹏、申威在野外工作中提供的帮助，在此一并表示感谢。
-
![]()
图 1 羌塘盆地构造单元划分（a）和达卓玛地区地质简图（b）
Figure 1. Generalized map showing tectonic units of the Qiangtang Basin (a) and geological sketch map of the Dazhuoma area (b)
-
王剑, 丁俊, 王成善, 等.青藏高原油气资源战略选区调查与评价[M].北京:地质出版社, 2009:271-298. 王成善, 尹海生, 刘池洋, 等.西藏羌塘盆地古油藏发现及其意义[J].石油与天然气地质, 2004, 25(2):139-143. 尹海生, 高春文, 张小青, 等.羌塘盆地双湖地区古油藏白岩储层的显微组构特征及意[J].成都理工大学学报:自然科学版, 2004, 31(6):611-615. 王剑, 谭富文, 李亚林, 等.青藏高原重点沉积盆地油气资源潜力分析[M].北京:地质出版社, 2004:1-317. 张小青, 伊海生, 朱迎堂.羌塘盆地双湖地区白云岩储集层特征研究[J].西南石油学院学报, 2005, 27(5):10-13. 赵百民, 郝天珧, 徐亚, 等.油气资源探测中的物性研究[J].地球物理学进展, 2009, 24(5):1689-1695. Lucia F J. Rock-fabric/petrophysical classification of carbonate pore space for reservoir Characterization[J]. AAPG Bulletin, 1995, 79:1275-1300. Lucia F J. Rock-fabric/petrophysical classification of carbonate pore space for reservoir Characterization[J]. AAPG Bulletin, 1995, 79:1275-1300.
Amthor J E, Friedman G M. Dolomite-rock textures and secondary porosity development in Ellenburger Group carbonates(Lower Or-dovician), West Texas and southeastern New Mexico[J]. Sedimentol-ogy, 1991, 38(2):343-362. Amthor J E, Friedman G M. Dolomite-rock textures and secondary porosity development in Ellenburger Group carbonates(Lower Or-dovician), West Texas and southeastern New Mexico[J]. Sedimentol-ogy, 1991, 38(2):343-362.
于兴河, 于兴志, 王宝清, 等.油气储层地质学基础[M].北京:石油工业出版社, 2009:362-382. Sibley D F, Gregg J M. Classification of dolomite rock textures[J]. Journal of Sedimentary Research, 1987, 57(6):967-975. Sibley D F, Gregg J M. Classification of dolomite rock textures[J]. Journal of Sedimentary Research, 1987, 57(6):967-975.
Dunhum R J. Classification of carbonate rocks according to depositional texture[C]//Ham W E. Classification of carbonate rocks Tul-sa, Okla.,Amer. Assoc. Petrol. Geol., 1962:108-121. Dunhum R J. Classification of carbonate rocks according to depositional texture[C]//Ham W E. Classification of carbonate rocks Tul-sa, Okla., Amer. Assoc. Petrol. Geol., 1962:108-121.
GB/T29172-2012.岩心分析方法[S].北京:中国标准出版社, 2013. Hearn C L, Ebanks W J, Tye R S, et al. Geological factors influencing reservoir performance of the Hartzog Draw filed, Wyoming[J]. Journal of Petroleum Technology, 1984, 36(8):1335-1344. Hearn C L, Ebanks W J, Tye R S, et al. Geological factors influencing reservoir performance of the Hartzog Draw filed, Wyoming[J]. Journal of Petroleum Technology, 1984, 36(8):1335-1344.
姜在兴.沉积学[M].北京:石油工业出版社, 2003:1-540. 梁定勇.西藏羌塘盆地南部中侏罗统布曲组白云岩成因及储层特征研究[D].四川:成都理工大学硕士学位论文, 2014:18-32. 郑有业, 何建社, 李维军, 等. 1∶25万区域地质调查报告(兹格塘错幅).西藏自治区地质调查院, 2003: 1-362.
下载:
计量
- 文章访问数: 2112
- HTML全文浏览量: 260
- PDF下载量: 230
