文昌A油田主力油组潮坪相划分及优势储层预测

Tidal flat facies division and dominant reservoir prediction of main oil group in Wenchang A oilfield

文昌A油田ZJ1Ⅳ油组为潮坪相沉积,利用各种动静态资料、水平井信息及三维地震数据开展了基于沉积微相再认识的储层精细研究,识别出潮上带、潮间带、潮下带三种亚相类型,并对亚相内部各微相及砂体展布形态进行刻画;同时结合钙质层分布并采用地震分频解释技术,分相带预测优势储层展布范围。结果表明,潮道微相中钙质层不发育的主体位置为优势储层区,砂坪、混合坪相带中I类优势储层为有利储层。最终解决了制约油田开发效果的地质因素,并为油田后续剩余油挖潜及提高采收率提供地质依据。

Wenchang A oilfield ZJ1 IV is a tidal flat facies deposit, by using a variety of dynamic and static data, horizontal well information and 3 D seismic data, a detailed study on sedimentary microfacies re-recognition of the reservoir was carried out, three sub-facies types, supratidal, intertidal and subtidal were identified, and the distribution of microfacies and sand bodies were described. At the same time, the distribution of calcareous layers and seismic frequency division interpretation technique are combined to predict the distribution range of dominant reservoirs. The results show that the dominant reservoir is the main place where calcareous layer is not developed in tidal channel microfacies, and the type I dominant reservoir is the favorable reservoir in sand flat and mixed flat facies belt. Ultimately, the geological factors that restrict the development effect of the oilfield are solved, and the geological basis is provided for the exploration of residual oil and the improvement of oil recovery.