西湖凹陷苏堤构造带深部储层次生孔隙的发育特征与有机酸之间的关系

The Relationships Between the Development Feature of Secondary Pore of Reservoir of Deep Strata and Organic Acids in Sudi Structural Belt,Xihu Sag

西湖凹陷苏堤构造带深部的平湖组和花港组地层中普遍发育的次生孔隙;这些次生孔隙具有良好的连通性,它们的存在大大改善了研究区储层的储集及渗滤性能。勘探与开发证实这些次生孔隙普遍发育的储层中油气储量非常可观,这使得对该地区次生孔隙成因的研究意义重大。研究过程中笔者发现在砂岩储层与有机碳含量较高的优质烃源岩接触的部位次生孔隙往往更加发育,这说明次生孔隙的发育可能与烃源岩成熟演化过程中形成的有机酸有关。为了验证这一推测笔者在观察了255个岩心、薄片资料以及6口井部分层段的扫描电镜资料,收集了大量有机地化数据和185个砂岩样品的粘土矿物X衍射方面的数据,并在对这些资料和数据进行整理和分析的基础上写了本篇文章。希望我们所做的工作能够对以后本地区以及其他相似地区的油气的勘探与开发起到一定积极作用。

Secondary porosity developed widely in the Pinghu group and huagang group of Sudi structural belt in Xihu sag and the connectivity of these secondary porosities is very good which greatly improve the reservoir and permeability of sandstone reservoirs in study area. Through explorationand development we comfirm the reserves of oil and gas are very considerable in these reservoir .Therefore,the study about the causes of secondary porosity of study area are greatly meaningful. In the course of the study, the authors find secondary porosities are more widespread in the sandstone reservoirs those are near the high-quality sourcerocks.Base on the phenomenon,we believe organic acids which areproduced in the course of organic matter maturation have important influence on the formation of Secondary porosity of reservoirs. In the process, the authors of this article observe 256 stone cores and thin sections ,and scanning electron microscopic data of some part of 6 wells;collect data of clay minerals X-ray diffraction of 185 sandstone samples and a lot of data of organic geochemistry.Then authours collate these material and data were analyzedto verify this point.We hope our work will play a positive role in the oil and gas exploration and developmentof this area and other similar areas in the future.