小层对比在低渗透砂岩小油田注水开发中的应用

针对陕北低渗透砂岩小油田因沉积微相多变，层内和层间非均质性强，整个油层组笼统注采开发采出程度低以及经济效益差等现状，通过对顺宁长2^1油藏充分利用岩芯分析和测井曲线等基础地质资料，加强沉积微相研究，开展油藏小层精细划分对比及小层砂体连通性分析．明确了主要注采小层在空间上的展布规律，为优化注水开发方案和选用先进注采配套工艺技术措施提供了比笼统注采更为精细的开发地质依据。实施后明显提高了采油速度、采出程度和经济效益。

APPLICATION OF SUBSTRATA CORRELATION IN PERIOD OF WATERFLOODING DEVELOPMENT FOR LOW PERMEABILITY SANDSTONE OF SMALL POOLS

The poor producing degree and the economic benefit of the low permeability sandstone by vague injection-production is caused by changeful sedimentary microfacies and high intra-layer and plane heterogeneity in whole oil reservoir set. By the study of sedimentary microfacies, division and correlation of substrata as well as analysis of connectivity in Chang 2-1 Formation of Shunning field based on the data of core well-logging and geologic information, the spatial distribution of the main injection-production sandstone is outlined which provides better development geologic evidences than vague injection-production technology to optimize the injection-production development scheme and select advanced matching technology. The speed and extent of producing, and economic benefit are improved clearly after bringing this technology into practice.