胡154井区长4+5段储层非均质性及其对剩余油开发的影响

Reservoir heterogeneity and its affection on the remained oil development for Member Chang 4+5 in Block Hu-154

为提高鄂尔多斯盆地胡154井区油藏剩余油开发效果,从粒度、渗透率、夹层、分层系数等多个参数入手,对长4+5段储层的宏观及微观非均质性进行了探讨。结果表明:受沉积作用影响,长4+5段储层层内非均质性和层间非均质性程度较强,纵向上渗透率值分布差异较大;砂体几何形态以及渗透率在平面上的差异较大,反映长4+5段储层平面非均质性程度很强,其中长4+52小层储层宏观非均质性最强;长4+5段储层孔隙结构较为复杂,微观非均质性很强。储层非均质性对于剩余油开发有较大影响,可采取降压增注、井网加密和深水调剖等措施解决此类问题。

In order to improve development effects of the remained oil in Block Hu-154 of Ordos Basin, from the viewpoints of the particle size, permeability, interbed, stratifying coefficient and so on, the macro and micro heterogeneities in Member Chang 4+5 reservoirs were discussed. The results show that influenced by the sedimentation, Member Chang 4+5 reservoirs have strong intra-layer and in-layer heterogeneities, and the permeability has a great vertical disparity, so do the geometric shape of the sandbody and the permeability in plane, which reflect the planar heterogeneity in Member Chang 4+5 reservoirs is rather strong, and Chang 4+52 Sublayer’s heterogeneity is the strongest;the pore structures in Member Chang 4+5 reservoirs are rather complex, thus the micro heterogeneity is also very strong. The reservoir heterogeneity has a great impact on the development of the remained oil, so the countermeasures such as depressurization and augmented injection, well pattern infilling and deep-water profile control can be taken solve these problems.