泌阳凹陷安棚深层系致密砂岩油气综合评价

Comprehensive evaluation on tight sandstone oil and gas of Anpeng deep layer series in Biyang depression

通过泌阳凹陷安棚深层系致密砂岩油气成藏要素分析,认为该区构造平缓,油源充足,砂体发育,储层致密,裂缝发育,源储紧密接触,油层"水锁效应"明显,具备形成致密砂岩油气藏的有利条件。通过储层再认识及油气层"四性"关系重新研究,认为该区孔隙度大于2.4%,渗透率大于0.2×10-3μm2的致密砂岩油层增储潜力为3 322×104 t,勘探开发潜力较大。综合考虑地质特点、油气层分布及水平井多级分段压裂工艺水平,该区致密砂岩油气层可分为7套开发组合层系。针对该区主力开发组合层系进行储层精细研究及目标评价,优选有利区部署水平井,实施多级分段压裂,取得了较好的开发效果。

Through hydrocarbon accumulation factors analysis on tight sandstone of Anpeng deep layer series in Biyang depression,the area is found to be characterized by gentle structure,abundance oil sources,tight reservoir,developed fracture,close contact between source rock and reservoir rock,and obvious water blocking effect of oil layers,therefore,the area is qualified with favorable conditions for tight sandstone reservoirs formation.After reservoir recognition and restudy of'Four-property relationship',the potential reserves of tight sandstone is 3 322×104 t,with the porosity is bigger than2.4%and permeability higher than0.2×10-3 μm2.Based on the geological features,multi-stage sequential fracturing technology has been applied and 7 series of development has been divided.In view of the main development series combination,reservoir fine study and target evaluation have been carried out,the horizontal well deployment for favorable area has been optimized,and multi-stage sequential fracturing has been implemented,which has achieved good development effect.