塔里木盆地迪那2气田特低渗砂岩储层应力敏感性研究

The Study on Stress Sensitivity of the Particular Low Permeability Reservoir in Dina 2 Gas Field of Tarim Basin

迪那2气田是西气东输的主力气田之一,地层压力高(106 MPa)、压力系数高(2.25),是一个带裂缝低孔、特低渗异常高压凝析气藏。为正确评价在开采过程中储层岩石随着地层压力的下降而发生的弹塑性形变,开展了迪那2气田储层应力敏感性实验研究。通过对岩心样品在不同有效应力下的孔隙度、渗透率的测试,分析了储层岩石物性随压力的变化规律,得到了迪那2气田典型储层的全应力应变曲线,定量地描述了地层压力降低后岩石出现的永久塑性变形特征。该成果为确定迪那2气田单井产能、制定气田开发规划奠定了基础,也为类似气田的开发基础研究提供了有效的技术方法和手段。

Dina 2 Gas Field, which is one of major gas field of Xiqidongshu, with the FMP of more than 106 MPa and the pressure coefficience of more than 2.0, belongs to a low porosity, low particular permeability and abnormal pressure gas reservoir with crack. Dina 2 Gas Field has carried through stress sensitivity experimentation research of reservoir to evaluate rightly elastic-plastic deformation with the FMP dropping among developing the gas field, by mean of testing porosity and permeability of drillcore sample under vary effective stress, the paper reserves representative reservoir complete stress strain curve of Dina 2 Gas Field, and depicts quantitatively forever plastic deformation character of rock with the FMP dropping. This job settles basement for confirming flow potential of single well and drawing up development planning of Dian 2 Gas Field, also offers valid method and measure for fundamental research of analogous gas reservoir development.