本文選題：鄂爾多斯盆地 + 盒8段　； 參考：《西安石油大學》2015年碩士論文

【摘要】：研究區(qū)位于陜北斜坡南部,構造特征為一平緩的西傾單斜,地層傾角小于1°,地層穩(wěn)定,構造簡單。本區(qū)屮二疊統(tǒng)石盒子組盒8段屬于三角洲前緣亞相沉積,根據Sr/Ba值、B/Ga值、硼含量判斷其沉積環(huán)境屬于淡水一微鹽水環(huán)境。三角洲前緣的水下分流河道砂體是盒8段天然氣的主要儲集體,巖性主要為石英砂巖及巖屑砂巖,壓實作用和膠結作用大大降低了儲層的孔隙度和滲透率,而溶蝕作用則產生了次生溶蝕孔隙,使儲層物性得到了改善,總體來說盒8儲層屬于特低孔、特低滲儲層。近距離運移、多層段聚集是鄂爾多斯盆地陜北斜坡地區(qū)上古生界天然氣主要的成藏方式。下伏本溪組、太原組、山西組的煤系氣源巖是盒8氣藏主要的烴源巖。上傾致密層及側向漫灘泥質巖形成的巖性圈閉是研宄區(qū)主要的圈閉類型。鄂爾多斯盆地上古生界泥巖普遍存在由于“欠壓實”產生的剩余壓力,通過泥巖聲波時差與深度關系圖可以發(fā)現(xiàn)過剩壓力最大出現(xiàn)在上石盒子組下部泥巖段,成為盒8天然氣藏的直接蓋層。運用等效深度法做出研究區(qū)盒8泥巖過剩壓力分布圖,結合砂厚、沉積相、儲層物性總結了研究區(qū)盒8氣藏的控制因素。結果表明,己勘探發(fā)現(xiàn)的盒8段天然氣分布范圍大部分出現(xiàn)在剩余壓力較低的范圍內,同時受沉積相、優(yōu)質儲層、圈閉有效性等多重因素控制。
[Abstract]:The study area is located in the southern part of the slope of northern Shaanxi. Its structural characteristics are a gentle westward inclination with a dip angle of less than 1 擄, stable strata and simple structure. Bo8 member of Shihezi formation belongs to delta front subfacies deposition in this area. According to the Sr/Ba value and B / Ga value, boron content indicates that the sedimentary environment belongs to freshwater and micro-brine environment. The subaqueous distributary channel sand body in front of delta is the main reservoir of natural gas in Bo8 formation. The lithology is mainly quartz sandstone and lithic sandstone. Compaction and cementation greatly reduce the porosity and permeability of reservoir. The dissolution resulted in secondary dissolution porosity, which improved the physical properties of reservoir. Generally speaking, Bo8 reservoir belongs to ultra-low porosity and ultra-low permeability reservoir. Close migration and multilayer accumulation are the main reservoir forming methods of Upper Paleozoic natural gas in northern Shaanxi slope area of Ordos Basin. The coal measures gas source rocks of Xiafubengxi formation, Taiyuan formation and Shanxi formation are the main hydrocarbon source rocks in Box 8 gas reservoir. The lithologic traps formed by the updip dense layers and lateral muddy rocks are the main types of traps in the study area. The residual pressure of the Upper Paleozoic mudstone in the Ordos Basin is generally due to the "undercompaction". The excess pressure is found to be the largest in the lower mudstone section of the Upper Shihezi formation through the diagram of the relationship between the sonic time difference of the mudstone and the depth of the mudstone. Become the direct cap of box 8 natural gas reservoir. By using the equivalent depth method, the excess pressure distribution map of block 8 mudstone in the study area is made, and the controlling factors of box 8 gas reservoir in the study area are summarized with the combination of sand thickness, sedimentary facies and reservoir physical properties. The results show that the distribution range of natural gas in Bo8 member is mostly within the range of lower residual pressure, which is controlled by many factors, such as sedimentary facies, high quality reservoir, trap validity and so on.
【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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