塔里木油田缝洞型碳酸盐岩油藏开发特征

Characteristics of exploration and development of fractured-vuggy carbonate rock oil pool in Tarim oilfield of China

探讨塔里木盆地碳酸盐岩缝洞型油藏的开发动态特征。通过储层研究,储集体主要以溶蚀孔洞、裂缝为主。依据地震反射特征将地震反射类型分为深串、浅串、整体串、片状反射、杂乱反射;结合塔里木油田生产特征及地震反射特征,分析了研究区的产液能力特征、产量递减规律、含水变化及出水类型、油藏天然能量。结果表明区块的产能主要来自于深串和整体串,单井衰竭式开采产量递减快不能维持稳产;油井出水类型以缓慢型和台阶型为主,且构造位置对出水特征影响明显,暴性水淹型都处在构造边部位;整体天然能量不充足,少数井具有一定能量与含水分析结果一致。该区生产状况一般,需进一步开展研究完善开发方案。

This paper researches the development dynamic characteristics of the fractured-vuggy carbonate rock oil pool in Tarim. Through studying the carbonate reservoir in the Tarim oilfield, it is found that the main reservoir spaces are solution pores-cavities and fractures. Based on the seismic reflection characteristics, the types of the seismic reflection can be classified as five types, that is, shallow string beads reflection, deep string beads reflection, whole string beads reflection, flaky reflection, and jumble reflection. According to the production and seismic reflection characteristics in the Tarim oilfield, the paper analyzes the liquid production capability feature, production decline law, water-cut variation, water production type, and reservoir natural energy of this block. The result indicate that the yield of the field is mainly provided by the deep string beads reflection and whole string beads reflection, and that the production of the depletion type of exploitation from a single well decreases quickly and can not maintain stability. The water production types of the oil wells are slow and step ones. The structural location has a direct impact on the water production type, but the fast flood type is always on the structural edge, The whole natural energy of the field deficient, and only few wells have some natural energy which accords with the analytic results of the water type. The production status of the field is not good, and it needs to make a further research and adjust the development plan.