生物扰动构造与塔中东河砂岩储集性能的关系

RELATIONS BETWEEN BIOTURBATION STRUCTURES AND PETROPHYSICAL PROPERTIES OF DONGHE SANDSTONE RESERVOIRS IN CENTRAL TARIM

齐永安

Qi Yong

塔里木盆地塔中地区上泥盆统东河砂岩储层中发育有大量的遗迹化石及其形成的扰动构造。根据生物扰动特征及砂岩成岩作用和孔隙结构分析,生物扰动构造与储层物性呈负相关,即生物扰动越强,储层物性越差;而弱扰动或未扰动部位原生孔隙得以最大程度保存下来,形成高孔高渗优质储层。

Abundant trace fossil including and its bioturbation structures were discovered in Donghe sandstone reservoirs of Upper Devonian in central Tarim.Based on the features of bioturbation and analysis of sandstone diagenesis and porosity structures,the bioturbation structures and the reservoir petrophysical properties appear to be negative correlation.It means that the more intensely the bioturbation,the worse the petrophysical properties of the reservoirs.The primary porosity was preserved to the greatest extent in the place of unbioturbation or weak bioturbation,thus forming high porosity and high permeability reservoirs.

10.11743/ogg19980410