摘要
本文讨论了羌塘盆地羌资2井中侏罗统布曲组碳酸盐岩岩石学及储集物性特征。碳酸盐岩主要有亮晶鲕粒灰岩、白云岩、泥晶灰岩,以及他们之间的过渡类型;储集空间主要有孔隙与裂缝两种类型,表现为孔隙—裂缝组合。孔隙可分为粒间溶孔、粒内溶孔、晶间孔、晶间溶孔、沿缝合线等分布的溶孔;裂缝可分为构造缝、构造—溶解缝、压溶缝和溶蚀缝。亮晶鲕粒灰岩孔隙度平均值1.084%,渗透率平均值0.0319×10-3μm2;白云岩孔隙度平均值1.77%,渗透率平均值0.1591×10-3μm2;储集物性特征均为低孔低渗、高排替压力、微-细喉道、分选中等-不好的负偏态细歪度特征。泥晶灰岩和过渡类型灰岩的储集物性特征与亮晶鲕粒灰岩和白云岩相似。最后,讨论了成岩作用对碳酸盐岩储集物性的影响,并认为成岩作用对储集物性的不利影响明显大于有利影响。
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 μm^2; the average po-rosity of dolomite is 1.77% and its average permeability is 0.1591×10^-3 μm^2. 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.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2009年第5期590-598,共9页
Acta Geoscientica Sinica
基金
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。
关键词
羌塘盆地
石油地质钻探
中侏罗统
碳酸盐岩
孔隙特征
储集物性特征
Qiangtang Basin
petroleum drilling
Middle Jurassic
carbonate rocks
pore characteristics
reservoirphysical property
