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异常高压油气藏是塔里木盆地台盆区重要的勘探目标,其中巴什托构造于泥盆系东河塘组、石炭系巴楚组、小海子组和下二叠统南闸组发现了异常高压油气藏。利用钻井测井与试油气资料,根据X-射线衍射黏土矿物含量、突破压力与比表面积等实验分析结果,探讨巴什托构造异常高压特征与成因。研究表明,石炭系—二叠系处于晚成岩作用阶段,黏土矿物大量脱水、天然气充注和存在欠压实带是形成巴什托构造异常高压的主要原因。高矿化度封闭型地层水、高突破压力的Ⅰ类和Ⅱ类泥岩和膏盐岩盖层是保持巴什托构造异常高压的重要条件。
The abnormal high-pressure reservoirs are the important exploration targets in the Tarim Basin, where Bashituo was found in the Donghutang Formation of the Devonian, the Bachu Formation, the Xiahaizi Formation and the Lower Permian Nanzha Formation in the Carboniferous. Oil and gas reservoir. According to the experimental data of X-ray diffraction, such as clay mineral content, breakthrough pressure and specific surface area, the characteristics and causes of the abnormal structural high pressure in Bassto are discussed. The results show that the Carboniferous-Permian is in the stage of late diagenesis, and the major dehydration of clay minerals, filling of natural gas and under-compaction belt are the main reasons for the formation of abnormal Baishituo high pressure. Highly salinity closed formation water, high breakthrough pressure type I and II mudstone and gypsum salt caverns are important conditions for maintaining the Bashituo anomalous high pressure.