一体化勘探模式在南皮斜坡岩性油气藏中的应用

Application of the integrated exploration mode in lithologic reservoirs of Nanpi slope

南皮斜坡位于大港油田第二大富油气凹陷沧东凹陷南部,孔二段为其主要含油层系。近年在该区孔二段以岩性油气藏勘探为目的的突破井kn 6井获得成功,证实该斜坡区岩性地层油气藏具有勘探潜力。为深化该区孔二段油气藏勘探,进一步开展该区孔二段基本成藏条件研究,以断陷湖盆斜坡区岩性油气藏成藏理论为指导,形成针对改造型湖盆岩性地层油气藏勘探的一体化勘探模式,该模式包括含油气构造、沉积模式、烃源岩评价、油气成藏、岩性圈闭识别、目标评价、井位部署7个方面,并对这7个方面的应用情况进行了详细的阐述。在此模式下部署实施的kn 7井、kn 17井均获得成功,南皮斜坡孔二段岩性地层油气藏成为一个新的勘探领域,认为南皮继承性斜坡具有凸起顺向供砂、侵蚀沟槽输砂、单一坡折控砂、斜坡低位富砂的特点并建立了不同岩性储集层识别标准,形成油页岩发育区脆性储集层综合描述技术,通过开展砂体分布、烃源岩与储集性能三元定量综合评价技术及油藏综合描述技术指导目标评价,有效地预测岩性圈闭的有利范围。

Nanpi slope is located in the southern Cangdong sag of Dagang Oilfield,which is the second largest oil-rich sag,Ek2 is the major oil-bearing series.In recent years,the breakthrough well kn 6 in the area which was for the purpose of lithologic reservoir exploration obtained success and confirmed that the lithologic reservoirs in the slope region had the exploration potential.To deepen Ek2 oil and gas exploration,further study basic accumulation conditions in Ek2 area,take the lithologic reservoir forming theory of the rift lacustrine basin as the guide,an integrated reservoir exploration mode was formed for the transformation of lacustrine lithostrata,which includes oil and gas structures,depositional model,source rock evaluation,oil and gas accumulation,lithologic traps identification,objective evaluation and well deployment,this paper elaborated the applications of the above 7 aspects.Well kn 7 and well kn 17 were deployed successfully under this mode,Ek2 lithologic reservoir in Nanpi slope became a new exploration area.The authors thought that Nanpi inherited slope had the characteristics that arch forward supplies sand,erosion groove migrates sand and single slope break controls sand,lower slope is rich in sand,established different identification standards for lithologic reservoirs,and formed a comprehensive description technology for the brittle reservoir in the oil shale developed zone.By conducting sand distribution,source rock and reservoir properties of the ternary quantitative integrated evaluation techniques and comprehensive reservoir description technology to guide the objective evaluation,a beneficial range for the lithologic traps was effectively predicted.