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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。
The Changxing Formation in the eastern Sichuan-Yubei area includes the Taichung Trough (deep-water basin), the gently sloping front edge of the platform, the reef bank on the margin of the platform and the open platform, and is surrounded by the eastern section of the Kailang-Liang platform The marginal reefs and beach facies strata are the most important oil and gas exploration intervals. The reservoir lithology is mainly composed of reef and beach facies crystalline dolomite with wide distribution area, large thickness and good physical properties. Based on the analysis of sedimentary facies and logging facies and seismic facies analysis techniques, through the analysis of phase response characteristics and seismic reflection and seismic attribute of rock-electric conversion well known reefs and banks, the reef and beach facies The log facies and seismic facies models of dolomite reservoirs confirm that the chimney effect in the seismic profile is an effective indicator of the reef and beach facies dolomite reservoirs and gas reservoirs. Based on this, the established reef and beach body geological models are used as the seismic inversion constraints for predicting the favorable facies belts. Based on the regional geological data to predict the favorable bio reefs and the facies dolostone reservoir development zones and the dolomite thickness distribution maps, Determine the preferred exploration target for favorable reservoir development.