黄陵地区延长组长6段深水砂岩储层特征分析

以鄂尔多斯盆地黄陵地区延长组长₆段为研究对象，基于区内丰富的钻井取芯、测录井及分析化验资料，对长₆段深水砂岩特征及不同砂体类型储层之间的差异性进行了分析。结果表明，根据砂体形成机制及其构造特征的不同，研究区砂体类型可划分为砂质碎屑流砂体、砂质滑塌砂体及浊流砂体3大类。其中，砂质碎屑流砂体的石英、长石含量及结构成熟度相对较高，储集空间以长石溶孔和残余粒间孔为主，储层物性也明显优于其他两类砂体。进一步分析发现，由于结构成熟度和矿物含量的差异，砂质碎屑流砂体成岩早期抗压实压溶作用更强，中晚期易溶矿物溶蚀增孔、构造破裂增缝等建设性成岩作用也较为强烈，从而决定了砂质碎屑流砂体是研究区最有利的储集岩体。

An Analysis on the Characteristics of Deepwater Sandstone Reservior of Chang 6 Member,Yanchang Formation in Huangling Area

Taking the Chang 6 Member of the Yanchang Formation in Huangling Area of the Ordos Basin as the research object, the characteristics of the deep water sandstone of Chang 6 Member and the differences between different types of sand bodies are analyzed based on the abundant drilling and coring, logging and analysis of laboratory data. The results show that the reservoir rock types in the study area can be divided into three categories: sandy debris flow sand body, sandy slumping sand body and turbidite sand body according to their formation mechanism and structural characteristics. Among them, the content of quartz and feldspar and structural maturity in sandy debris flow sand body are relatively higher. The storage space is dominated by residual intergranular pores and feldspar dissolved pores. The physical properties of the reservoir are also significantly higher than those of the other two types of sand bodies. Further analysis found that due to the difference in structural maturity and mineral content, the compaction and dissolution of sandstone debris flow sand body is stronger in the early stage of diagenesis, and in the middle and late stages, soluble minerals increases pores and rupture increased fractures. It is determined that sandy debris flow sand bodies are the most favorable type of reservoir rock in the study area.