深层巨厚砾岩稠油油藏划分开发层系的隔夹层研究

Study of interbeds for dividing development layers in very thick gravel deep heavy oil reservoir .

方法根据砂体岩性变化及电性特征，利用测井资料、压裂分析结果，计算出不同岩性隔夹层的杨氏模量、泊松比、破裂压力等，从而选择隔夹层。目的为深层巨厚砾岩稠油油藏开发层系的划分与组合，提高油层纵向动用程度和采收率提供依据。结果该方法应用于冷４３块开发方案，有效地选择了非泥质隔夹层，将Ｅ２ｓ２３油层划分为两套层系开发，利用天然能量开采，单井初期日产油１０～１５ｔ；转注水后，非泥质隔夹层起到划分开发层系的隔层作用。结论对于巨厚砾岩稠油油藏，在泥岩隔层不发育情况下，将非泥岩隔夹层有效组合隔离段，可以实现划分层系开发。

MethodAccording to lithology variation in sandbody and electrical characteristics, by using log information and fracturing analysis results, interbeds with different lighology are selected after whose Young's modulus, Poissons ratio, fracturing pressures and etc have been calculated. Purpose\ To provide accordance for dividing and composing development layers of very thick gravel heavy oil reservoir and for improving oil bearing formation vertical utilization percentage and recovery. Result\ Non-shaly interbeds are successfully selected in Leng 43 fault block by adopting this method. Oil bearing formation E\-2 s \+2\-3 is divided into two sets of development layers and it is producing at 1015t/d each well initially with natural energy. Non-shaly interbeds act as isolation beds even after water injection production. Conclusion\ For very thick gravel heavy oil reservoir, if no development of shaly interbeds, development with divided layers can be realized if non-shaly interbeds can form an effective isolation interval.\;