论文部分内容阅读
通过测井及地质资料分析,发现川东地区三叠系飞仙关组底部的泥岩纯度及厚度与下伏二叠系长兴组是否发育生物礁有密切联系,其原因是存在长兴组生物礁的地点为局部正地形,处于相对高能沉积环境,导致泥岩沉积少且不纯,因而可以根据飞仙关组底部沉积物的岩石类型和厚度来预测长兴组生物礁纵向分布。将单井测井解释的生物礁与组合式地震成像测井(CSI)资料异常区对比,根据CSI测井资料异常可预测生物礁的横向展布,并对云安14井生物礁分布作了预测。在五百梯构造长兴组生物礁体分布研究中,用地层倾角矢量点的红模式预测生物礁的主体方位,用CSI测井资料和克里金技术恢复其形态,据此预报天东71井、天东72井、天东76井在长兴组将钻遇生物礁。五百梯构造目前仅天东72井钻入长兴组,证实该井点处存在长兴组生物礁,表明多种测井方法相结合研究生物礁的横向展布及规模是可行的,CSI测井技术有明显优势。图3表2(邹冬平摘)
Through logging and geologic data analysis, it is found that the purity and thickness of mudstone at the bottom of Feixianguan Formation in Triassic in eastern Sichuan are closely related to the development of reefs in Changxing Formation of Permian. The reason for this is the existence of reefs in Changxing Formation The site is locally positive and relatively high-energy sedimentary environment, resulting in less sediment and impure mudstone. Therefore, the longitudinal reef distribution of Changxing Formation can be predicted according to the rock type and thickness of the sediments in Feixianguan Formation. By comparing the reefs explained by single-well logging with the anomaly zones of combined seismic imaging logs (CSI), we can predict the horizontal distribution of reefs based on the anomaly of CSI logging data and make the reef distribution in Yunan-14 well prediction. In the study of the distribution of bio-reefs in the Changxing Formation with 500 steep structures, the main orientation of the reefs was predicted by the red pattern of the dip angle of stratigraphic dip, and the morphology of the reefs was restored with CSI logging data and Kriging techniques. Based on this, , Tiandong 72 wells, Tiandong 76 wells in Changxing group will encounter reefs. At present, only the Tiandong 72 well drilled into the Changxing Formation, confirming that Changxing Formation reef exists at this well point, indicating that it is feasible to combine a variety of logging methods to study the horizontal distribution and scale of reefs. The CSI logging Technology has obvious advantages. Figure 3 Table 2 (Zou Dongping pick)