摘要
为提高储层孔隙结构的定量评价及认识,以促进原油的高效开采,针对鄂尔多斯盆地永宁油田顺宁—洛河北区长6低孔低渗储层,利用毛管压力曲线求取孔隙结构的分形维数来定量描述孔隙结构的复杂程度。结果表明1)研究区68块样品的孔隙结构分形维数为2.34~2.91,说明储层孔隙非均质性较强;2)68块样品中有21块样品在线性拟合的结果中存在曲线分段的特征,表明不同的孔径范围具有不同的分形维数;3)分形维数可以指示孔隙结构发育的程度,Ⅰ类孔隙结构的分形维数小于2.77,Ⅱ类孔隙结构的分形维数为2.78~2.83,Ⅲ类孔隙结构的分形维数为2.84~2.90,Ⅳ类孔隙结构的分形维数大于2.91。该研究成果可以为低孔低渗储层精细评价及油田制定合理的开发方案和增产措施提供依据。
In order to improve the quantitative evaluation and understanding of the pore structure of the reservoir and promote the efficient exploitation of crude oil,the fractal dimension of the pore structure was obtained by using the capillary pressure curve to quantitatively describe the complexity of the pore structure in the Chang6 low-porosity and low-permeability reservoir in Shunning-Luohe north area of Yongning Oilfield,Ordos Basin.The results show that:1)The fractal dimension of pore structure of 68 samples in the study area ranges from 2.34 to 2.91,indicating that the pore heterogeneity of the reservoir is strong;2)Among the 68 samples,21 samples have the feature of curve segment in the linear fitting results,indicating that different pore size ranges have different fractal dimensions;3)The fractal dimension can indicate the development degree of porestructure.The fractal dimension of type I pore structure is less than 2.77,type II pore structure is between 2.78 and 2.83,type III pore structure is between 2.84 and 2.9,and type IV pore structure is greater than 2.91.The results of this study can provide the basis for the fine evaluation of low porosity and low permeability reservoir and the formulation of reasonable development plan and stimulation measures.
作者
井康康
董旭
蔺广泉
乔生虎
JING Kangkang;DONG Xu;LIN Guangquan;QIAO Shenghu(Yanchang Oilfield Exploration and Development Technology Research Center,Shaanxi Yan’an 716000,China;Zhidan Oil Production Plant,Yanchang Oilfield,Shaanxi Zhidan 717500,China)
出处
《非常规油气》
2021年第4期19-25,共7页
Unconventional Oil & Gas
基金
延长油田股份有限公司自主研究科技项目“水平井开发配套工艺技术研究与实践”课题“蒿巴寺油区水平井注氮气提高地层能量技术研究油藏工程论证”(ycsy2019ky-B-23-6-2)。