论文部分内容阅读
根据测井、岩心等资料综合分析恢复鄂尔多斯盆地白豹—华池地区的沉积环境,利用薄片资料分析储层物性特征及成岩相类型和分布。并在此基础上讨论沉积环境与成岩相的关系。研究认为研究区长6期发育河道型浅水三角洲前缘和与之伴生的深水滑塌成因重力流沉积,其中水下分流河道微相及深水砂质碎屑流沉积是砂体主要成因单元。储集砂体主要为长石砂岩和岩屑长石砂岩,物性较差,属于中低孔特低渗储层。储集空间是原生粒间孔、次生溶蚀孔和少量裂缝的组合。压实作用、溶解作用及胶结作用是影响储层物性的主要成岩作用。不同沉积单元砂体的成岩作用和物性不尽相同,其中三角洲前缘水下分流河道主要以弱压实—绿泥石胶结相为主,深水砂岩主要以长石溶蚀相为主,两者结合部位发育绿泥石胶结—长石溶蚀相,均为有利成岩相带。成岩相研究与沉积环境分析相结合能够更好地预测有利储层的分布。
Based on the comprehensive analysis of logging data and core data, the sedimentary environment of Baibao-Huachi area in Ordos Basin is restored and the reservoir physical characteristics and diagenetic facies types and distributions are analyzed by means of sheet data. On this basis, we discuss the relationship between sedimentary environment and diagenetic facies. It is believed that gravity flow sedimentation is associated with deep-water slump origin in the 6th developing channel shallow water delta front. The sedimentary facies of sub-distributary channel microfacies and deep-water sandy debris flow are the main units of sand body. The reservoir sand bodies are mainly feldspar sandstone and lithic feldspathic sandstone, which have poor physical properties and belong to the low-permeability and ultra-low permeability reservoirs. The reservoir space is a combination of primary intergranular pores, secondary eroded pores and a small number of fractures. Compaction, dissolution and cementation are the main diagenesis that affect reservoir physical properties. Diagenesis and physical properties of sedimentary unit sand bodies are different, of which the delta front distributary channel is mainly composed of weak compaction-chlorite cementation, and the deep-water sandstone is dominated by feldspar dissolution facies. Part of the development of chlorite cementation - feldspar corrosion facies, are favorable diagenetic facies belt. The combination of diagenetic facies study and sedimentary environment analysis can better predict the distribution of favorable reservoirs.