【摘要】：T34-S470井區(qū)位于鄂爾多斯盆地陜北斜坡西北部,面積約500km2。下奧陶統(tǒng)馬家溝組馬五段為該區(qū)重要產氣層。馬五段儲層地質特征的詳細研究對該地區(qū)進一步勘探與開發(fā)具有重要意義。該區(qū)域馬五段屬陸表海臺地環(huán)境,潮坪相十分發(fā)育。研究區(qū)馬五12與馬五13、馬五14孔隙度、滲透率、含氣性均較好,且平均值相當;馬五11、馬五22孔隙度、滲透率、含氣飽和度較差,屬于典型的低孔低滲型碳酸鹽巖儲層。馬五段儲層的主要成巖作用類型有白云石化作用、壓實作用、壓溶作用、溶蝕作用、去膏化作用、去白云石化作用等。成巖作用特征可概括為:白云石化為儲層發(fā)育奠定了良好的基礎。溶蝕作用有利于儲層的發(fā)育。儲集空間包括孔、洞、縫三大類和十幾個類型,其中未充填或充填程度的溶蝕孔(洞)、縫和晶間孔是研究區(qū)最主要的儲集空間類型。研究區(qū)馬五1-馬五4亞段的半充填-全充填裂縫超過80%,半充填-全充填的水平縫、垂直縫和斜交縫也超過75%。充填物以方解石為主,方解石的半充填-全充填影響了裂縫在改善本區(qū)儲層滲透性及促進天然氣運移方面的作用。綜合孔隙度、滲透率、測井含氣飽和度、壓汞曲線類型、有效厚度和無阻流量等指標,進行了儲層分類評價,將儲層進行了分類:I類儲層、II類儲層、III類儲層和IV類儲層,I類儲層分布于馬五13小層,共有5塊分布區(qū)域,面積較小。II類儲層在馬五13、馬五22、馬五12小層均有不同程度的分布。其中五13小層II類儲層的面積最大,馬五22小層次之,馬五12小層僅有3處零星分布。因此應將下一步勘探工作的重點放在馬五13小層和馬五22小層的II類儲層發(fā)育區(qū)。
[Abstract]:The T34-S470 well area is located in the northwest of northern Shaanxi slope of Ordos Basin, with an area of about 500km2. Ma5 member of Majiagou formation of Lower Ordovician is an important gas producing layer in this area. The detailed study of reservoir geological characteristics of Ma 5 member is of great significance for further exploration and development in this area. The Ma-5 member of this area belongs to the platform environment on the surface of the continent, and the tidal flat phase is very developed. The porosity, permeability and gas content of Ma 5 12 and Ma 5 13 and Ma 5 14 in the study area are good, and the average value is the same, and the porosity, permeability and gas saturation of Ma 5 11 and Ma 5 22 are poor, so they belong to the typical low porosity and low permeability carbonate reservoirs. The main diagenetic types of Ma5 member reservoir are dolomitization, compaction, pressure dissolution, degypsum, dedolomization and so on. The diagenetic characteristics can be summarized as follows: dolomitization has laid a good foundation for reservoir development. Dissolution is beneficial to the development of reservoir. Reservoir space includes hole, fracture and more than ten types, among which dissolution hole (cave), fracture and intergranular hole are the most important types of reservoir space in the study area, among which the dissolution hole (cave) without filling or filling degree is the most important type of reservoir space in the study area. In the study area, the semi-filling-full filling cracks in the Ma-51-Ma-5 4 subsection are more than 80%, and the semi-filling-fully filled horizontal joints, vertical joints and oblique joints are also more than 75%. Calcite is the main filling material. The semi-filling-full filling of calcite affects the role of fractures in improving reservoir permeability and promoting natural gas migration in this area. Based on the indexes of porosity, permeability, logging gas saturation, mercury injection curve type, effective thickness and unobstructed flow rate, the reservoirs are classified and evaluated, and the reservoirs are classified as type I reservoirs, II reservoirs, III reservoirs and IV reservoirs. Class I reservoirs are distributed in Ma 513 small layer, with a total of 5 distribution areas, with a small area. Type II reservoirs are distributed in Ma Wu 13, Ma 5 22 and Ma 5 12 small beds to varying degrees. Among them, the area of small layer II reservoir is the largest, the area of Ma 522 small layer is the largest, and there are only three sporadic distribution of Ma Wu 12 small layer. Therefore, the next exploration work should focus on the II reservoir development area of Ma 513 small layer and Ma Wu 22 small layer.
【學位授予單位】：西安石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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