| 藏北羌塘盆地羌资2井中侏罗统布曲组碳酸盐岩岩石学及储集物性特征 |
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| 关键词:Qiangtang Basin petroleum drilling Middle Jurassic carbonate rocks pore characteristics reservoir physical property |
| 基金项目:国家油气专项“青藏高原油气资源战略选区调查与评价” (编号: XQ-2004-06)子课题“羌塘盆地石油地质资料浅钻施工及测试分析”资助 |
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| Lithologic and Reservoir Physical Properties of Carbonate Rocks in the Middle Jurassic Buqu Formation inside Qiangzi-2 Borehole of the Qiangtang Basin in Northern Tibet |
| This paper mainly discusses the lithologic and reservoir physical properties of Middle Jurassic marine carbonate rocks in northern Tibetan Qiangtang basin. Carbonate Rocks of Buqu Formation consist dominantly of sparry oolitic limestone, micritic dolomite, micritic limestone and transitional limestone. Reservoir space is composed of pores and fissures. Pores can be classified into intergranular secondary pores, dissolution voids in the cement, dissolution voids in the granular intercrystalline pores and dissolution pores in crystals, whereas fissures can be divided into tectonic fissures, tectonic-dissolution fissures, dissolution fissures and stylolites. The average porosity of sparry oolitic limestone is 1.084%, and its average permeability is 0.0319×10-3 mm2; the average porosity of dolomite is 1.77% and its average permeability is 0.1591×10-3 mm2. The interstitial physical property parameters show that both sparry oolitic limestone and dolomite have low porosity and low permeability, high displacement pressure, micro-pore throat and mini- pore throat, and minus SK coefficients. The interstitial physical property parameters of micritic limestone and other kinds of carbonate rocks are similar to those of sparry oolitic limestone and dolomite. This paper also discusses the effects of different kinds of diagenesis on the improvement of the reservoir physical properties. |
| LI Zhong-xiong,WANG Jian,WANG Zheng-jiang,LI Rong,DU Bai-wei.2009.Lithologic and Reservoir Physical Properties of Carbonate Rocks in the Middle Jurassic Buqu Formation inside Qiangzi-2 Borehole of the Qiangtang Basin in Northern Tibet[J].Acta Geoscientica Sinica,30(5):590-598. |
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