川东—渝北地区长兴组发育有台内海槽（深水盆地）、台地前缘缓斜坡、台地边缘生物礁滩和开阔台地4 个相带，其中环绕开江—梁平台内海槽东段发育的台地边缘礁、滩相地层为最重要的油气勘探层段，储层岩性主要为礁、滩相的结晶白云岩，具有分布面积广、厚度较大和物性较好等特点。以沉积相分析为依据，以测井相和地震相分析为技术方法，通过已知礁、滩体的岩-电转换测井相响应特征与地震反射和地震属性分析，建立了礁、滩相白云岩储层的测井相和地震相模型，确定地震剖面中的烟囱效应是寻找礁、滩相白云岩储层和气藏的有效标志。在此基础上，以建立的礁、滩体地质模型作为预测有利相带的地震反演约束条件，结合区域地质资料预测有利生物礁、滩相白云岩储层发育区及白云岩厚度分布图，圈定出有利储层发育区的优选勘探目标。

There are four sedimentary facies developed in Changxing Formation in eastern Sichuan and northern Chongqing, including intraplatform trough （deep water basin）, platform slope, platform margin reef flat and open platform. Reef and shoal facies reservoir located in Kaijiang-Liangping intraplatform trough is the most important layers for oil and gas exploration. Crystal dolomite is the main lithology of reef and shoal facies reservoir, with wide area of distribution, great thickness and good physical property. Based on the analyses of sedimentary facies, logging facies and seismic facies, the geological model of the reef and shoal facies reservoir is established through the known rock- electricity transform pattern and logging response and the analysis of seismic reflection characteristics and geology property of reef and shoal. The obvious chimney effect on reef and shoal reservoir is defined. Based on the geological model established as the seismic inversion constraint, combined with regional geological information, the favorable zones of reef and shoal reservoir and dolomite distribution are predicted.