精细地层对比技术在油藏挖潜中的应用

The application of fine formation correlation to reservoir productivity improvement in oil field.

尕斯库勒油田位于柴达木盆地茫崖坳陷内 ,其中N1 —N2 1 油藏位于上第三系上新统下油砂山组 (N2 1 )和中新统上干柴沟组 (N1 )。由于该油藏含油井段长(12 0 0m)、沉积相类型多、对比标志层少 ,加之区内存在逆断层、同一油砂体油水界面不一致等多方面因素影响 ,导致地层对比工作复杂、构造形态不落实、油砂体分布规律不清楚。通过运用精细地层对比技术和计算机三维地质模型演示技术相结合 ,对N1 —N2 1 油藏进行研究 ,落实了断裂系统和构造形态、油砂体分布规律、油藏类型及控制因素 ,为方案调整提供了可靠的油藏模型 ;同时预测了有利的含油气区块 ,增加含油面积1.0km2 ,石油探明地质储量 110× 10 4 t。图 1参 3(王光付摘 )

Gasikule oil field is located in Mangya depression of Qaidam basin, and N 1-N 2~1 oil reservoirs exist in lower Youshashan Formation of Pliocene and Upper Ganchaigou Formation of Miocene whose oil-bearing intervals reach up to 1200 meters. The study area is characterized by different sedimentary facies, fewer correlation marker beds, two crossing reverse faults, long drilling and completion span, great changes of bushing elevations and heights above sea level, which results in the current different oil-water contacts determination in the same oil sand body and complicated strata correlation, and the oil sand body distribution and structural relief still remain unclear. This paper combines fine strata correlation with 3D geological model to comprehensively study the N 1-N 2~1 reservoirs to further determine faulting system, structural shapes, oil sand body distribution and oil reservoir type and its controlling factors. All the above mentioned provided a reliable reservoir model for program adjustment, and predicting favorable oil-bearing blocks. As a result oil-bearing area of 1.0 square kilometers was increased and oil in place of 110×10~4t was proved.