渤中凹陷X构造深层变质岩潜山含油气性录井评价方法研究

Logging evaluation method for oil-gas bearing properties of deep metamorphic rock buried hill of X structure in Bozhong Sag

随着渤海渤中凹陷X构造大型凝析气田的发现,深层变质岩潜山成为重要勘探方向,但变质岩潜山储层非均质性强,储层随钻分类评价难度大,已测试井油气产能具有明显差异。通过对区域已钻井录井、测井及测试资料分析,认为裂缝发育、含油气丰度高、供液能力强的优质储层是影响油气产能的关键因素。在确定X构造优质储层岩屑、气测和含油气性等各项录井参数表征,以及利用裂缝型储层发育指数法对有效储层精细归位的基础上,结合区域多口井优质储层发育情况及实际产能数据,建立了基于优质储层评价的随钻产能预测模型。实际应用效果较好,对录井资料在单井产能预测中应用具有一定的推进作用,可为区内未测试井的产能评估及后续开发方案提供技术支撑。

With the discovery of a large condensate gas field in X structure of Bozhong Sag, Bohai Sea, deep metamorphic rock buried hill has become an important exploration target.However, its reservoir heterogeneity is strong, and the classification and evaluation of reservoir while drilling are difficult.The productivity of tested wells is obviously different.Based on the analysis of regional drilling logging, well logging and test data, it is considered that the high-quality reservoirs with developed fractures, high oil and gas abundance and strong fluid supply capacity are the key factors affecting the productivity.On the basis of determining the characterization of various logging parameters such as rock cuttings, gas logging and oil-gas bearing properties of high-quality reservoirs in X structure, and using the fracture type reservoir development index method to fine locate the effective reservoirs, combined with the development of high-quality reservoirs in multiple wells in the region and the actual productivity data, a productivity prediction model while drilling based on the evaluation is established.The results indicate a good actual application effect, which has a good guidance for productivity prediction of single well, and provides a technical support for the productivity evaluation of untested wells and subsequent development plans.