摘要
为确定低阻油层的评价参数,以孤岛油田东营组油层为例,利用岩石物理图像定量分析技术和核磁共振(NMR)测试研究了该油层的微观孔隙结构,评价了微观孔隙结构特征对孔隙流体和油层渗流特性的影响,根据低阻储层特点建立了孔隙结构分析参数、孔隙流体识别方法和低阻油层流体输运模型。研究结果表明,低阻油层孔隙泥质丰富,泥质中微孔发育,低阻油层孔隙结构呈双重结构,并且只有孔径较大的粒间孔隙中的流体参与流动;NMR测试还表明,泥微孔连通度比较低,会降低孔隙渗流能力,尤其是泥鲕,会使渗透率大幅降低。研究结果有力指导了低阻油层的合理开发。
In order to determine the evaluation parameter of low-resistivity reservoir, taking Dongying Formation of Gudao Oilfield as an example, microcosmic pore structure of reservoir is studied by the quantitative analysis of petrographic image and NMH test. This paper evaluates the effect of microcosmic pore structure characteristics on reservoir seepage characteristics. The models of parameter analysis of pore structure, identification method of pore fluid and fluid transportation of low-resistivity reservoir areestablished in te^ns of the reservoir features. Study result shows that the shaliness is rich in low-resistivity reservoir pore, with micropore developed in shaliness, and that the pore structure presents dual structure. Only the fluid within intergranular pore with large pore size participates the flowing. NMR test shows that the connectivity of shaly micropore is low, which may decrease the seepage capability of pore. Especially, oolith would make the permeability greatly reduce. That can guide the rational development of low-resistivity reservoir.
出处
《断块油气田》
CAS
2012年第2期142-144,共3页
Fault-Block Oil & Gas Field
基金
国家自然科学基金项目"典型缝洞型油藏流动规律及数学模型"(10802079)资助
关键词
低阻油层
微观孔隙结构
岩石物理图像分析
核磁共振
可动水
T2差谱分析
low-resistivity reservoir, microscopic pore structure
petrographic image analysis
NMR
movable water, T2 differentialspectrum analysis
