摘要
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。
The sedimentary environment of Baibao-Huachi in Ordos basin is restored based on logging, core description, etc. We use the thin section to elucidate the physical properties of reservoirs and diagenetic facies,and then set up the correlation between sedimentary environment and diagenetic facies. The research results indicate that the shallow water delta front and deep-water slump sediment gravity flow deposits were developed in study area. The skeleton sand bodies are mainly composed of distributary channel and sandy debris flow deposits. The rock type is feldspathic sandstone and debris-feldspathic sandstone. The physical property of the reservoir is relatively poor,most of the reservoirs have low porous and low perme- able. The main pore type is divided into intergranular pore, and intergranular dissolved pore and microfissure. The diagenetic types which influence the physical property of reservoir include compaction, cementation and dissolution. Sand bodies in different sedimentary environments develop different diagenesis. Weak compaction-chlorite film cementation develops in the distributary channel and feldspar corrosion of deep water sandy debris, in contrast that the chlorite film cementation-feldspar corrosion does in the belt of tran- sition. Both of them are favorable places for hydrocarbon accumulation. The diagenetic facies belts incorporating with the sedimentary environment is better to predict the development of favorable reservoir and desserts
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2011年第5期796-806,共11页
Natural Gas Geoscience
基金
国家重大专项"岩性地层油气藏成藏规律
关键技术及目标评价"(编号:2011ZX05001)资助
关键词
鄂尔多斯盆地
上三叠统延长组
沉积环境
成岩相
低渗透储层
Ordos basin
Yanchang Formation
Sedimentary environment
Diagenesis facies
Super-low permeability reservoir.
