塔中西北部奥陶系异常压力成因及地质意义

塔中西北部地区奥陶系地层中存在异常压力,研究认为该异常压力的形成主要与油气聚集增压机理有关,其次为构造增压和流体热膨胀增压机理,火成岩侵入也是一种辅助的增压机理.异常压力的存在可以表征良好的储层和盖层的封盖能力,也与油气藏的分布有一定的关系,异常压力层的发育层位往往指示一定丰度的油气层,而油气层并不一定都是异常压力层.

Genesis and geological significance of the abnormal pressure in Ordovician formation,the Northwest of central Tarim Basin

There is abnormal pressure in Ordovician formation,Northwest of central Tarim Basin. According to the study in this paper,it is held that the key cause of the abnormal formation pressure is the pressurizing effect of oil & and the secondary cause of it is the pressurizing effect of structural pressure and thermal fluid expansion. Volcano rock intrusion is of auxiliary pressurizing effect. The existence of the abnormal pressure may show good reservoir and good sealing ability of cap-rocks. There is a certain relationship between abnormal pressure and the distribution of hydrocarbon reservoirs: oil and gas reservoirs of certain abundance may develop in abnormal pressure layer,but oil and gas layer is not necessarily abnormal pressure layer.