克拉玛依油田砾岩油藏剩余油分布与挖潜方向

Remaining oil distribution and potential tapping direction in conglomerate reservoir in Karamay Oilfield

针对七中、东区复模态结构砾岩油藏精细描述及调整挖潜工作,分析了砾岩油藏剩余油分布特点,利用描述剩余可采储量平面分布及产吸剖面分层动用状况特征,研究了剩余油分布规律、富集类型及挖潜方向,阐明了剩余油分布主要受断裂及构造高部位控制,以及注采不完善、层间干扰和水驱损失影响。平面上,剩余油集中分布在井间未动用部位、断裂附近、构造高以及曾经动用但水淹程度不高且有效厚度较大的部位;纵向上,剩余可采储量主要集中在克下组S73-3、S74-1砂砾体发育较好的小层上。从而,提出了该区下一步实施稳油控水为目的治理措施,为提高该区油田开发后期整体油藏开发效果提供了新的思路和依据。

Based on fine description and adjustment of potential tapping in conglomerate reservoir with the structure of complex modality in Middle District No. 7 and East Area, characteristics of remaining oil distribution in this reservoir is analyzed. Meanwhile, remaining oil distribution rules, enrichment type and potential tapping direction are analyzed by describing the features of remaining recoverable reserves areal distribution and production-entry profile produced status. Result indicates that remaining oil distribution is mainly controlled by fracture and structural high part and influenced by imperfect injection-production relation, interference among layers and loss of water flooding. In plane, remaining oil distributions are mainly centralized in parts of un-producing status, around fracture, structural high part and other parts with low flooding degree and large effective thickness and once produced. In vertical, remaining recoverable reserves are located in sublayer with better development of sandstone in Kexia Formation S7^3-3, S7^4-1. Thereby, the treatment meas- urements for next step to stabilizing oil production and controlling water cut are proposed for this area, which provides a new idea and basis for improving the whole reservoir development effect in the oilfield in the future.