發(fā)布時間：2018-05-19 05:56

  本文選題：姬塬地區(qū) + 致密砂巖儲層　； 參考：《長安大學》2015年博士論文

【摘要】：鄂爾多斯盆地姬塬地區(qū)延長組長8儲層是典型的致密砂巖儲層,儲層致密與油氣充注成藏關系的研究對認識該區(qū)石油富集規(guī)律及指導勘探開發(fā)部署具有一定的理論和現(xiàn)實意義。論文以巖芯觀察為基礎,綜合應用巖石薄片、鑄體薄片、掃描電鏡、粒度分析、X衍射、常規(guī)壓汞、恒速壓汞、電子探針、碳氧同位素、油氣包裹體等多種分析測試資料,對儲層巖石學及儲集性能、成巖作用特征以及儲層致密與油氣充注成藏關系進行研究,揭示相對優(yōu)質(zhì)儲層的主控因素,建立研究區(qū)致密砂巖儲層的綜合評價標準,對儲層進行評價預測。研究表明,姬塬地區(qū)長8儲層以細粒長石巖屑砂巖和巖屑長石砂巖為主,填隙物含量較高,巖石總體成分成熟度低、結構成熟度中等。儲層孔隙度平均為8.67%,滲透率平均為0.46×10-3μm2,物性總體為低孔超低滲。儲層孔隙結構可劃分為4種類型,以Ⅱ類較低排驅(qū)壓力—小孔喉型占主導地位。儲層孔隙半徑主要分布(80~250)μm之間,屬于大孔隙的范疇。隨著滲透率增加,喉道半徑分布范圍變寬,而孔喉半徑比分布高值比例減小。儲層物性與分選系數(shù)、最大進汞飽和度、孔隙和喉道進汞飽和度為正相關性,與結構系數(shù)為負相關性。研究區(qū)長8儲層成巖作用類型豐富復雜,主要包括壓實、膠結、溶蝕等作用。成巖演化普遍達到中成巖階段A期。定量計算視壓實率平均為0.42,視膠結率平均為0.58,壓實和膠結強度均為中等偏強。視溶蝕率平均為0.34,為中等強度溶蝕。確定靜水條件下浮力運移的臨界喉道半徑上限為0.592μm,推算儲層致密的孔隙度上限為12%�？紫堆莼坑嬎惚砻�,壓實后剩余孔隙度分布在19.7%~25.56%之間,膠結作用后孔隙度普遍小于12%。壓實作用造成原生孔隙大量減少,而晚期膠結作用是造成研究區(qū)長8儲層致密的根本原因。儲層致密與油氣充注成藏時序關系研究表明,中侏羅世之后,低熟油氣開始逐漸形成并充注,在早白堊早期油氣小規(guī)模成藏,早白堊世中期油氣大規(guī)模充注成藏,油氣大規(guī)模成藏與姬塬地區(qū)長8儲層致密同時進行。致密砂巖儲層在整體低孔、低滲的背景上仍發(fā)育部分相對優(yōu)質(zhì)儲層,其控制因素有沉積作用、成巖儲集相及構造裂隙等。在常規(guī)儲層評價基礎上,優(yōu)選排驅(qū)壓力、孔隙結構類型、喉道半徑等反映致密砂巖儲層孔隙結構特征的新參數(shù),建立儲層的綜合評價標準,預測研究區(qū)內(nèi)優(yōu)質(zhì)儲層的分布,指導下步的勘探開發(fā)部署。
[Abstract]:Yanchang formation 8 reservoir in Jiyuan area of Ordos Basin is a typical tight sandstone reservoir. The study on the relationship between reservoir density and oil and gas accumulation is of theoretical and practical significance in understanding the law of oil enrichment and guiding exploration and development in this area. On the basis of core observation, the paper synthetically applies various analytical and testing data, such as rock thin slice, cast thin piece, scanning electron microscope, particle size analysis X diffraction, conventional mercury injection, constant velocity mercury pressure, electron probe, carbon and oxygen isotope, oil and gas inclusion, etc. The petrology and reservoir properties, diagenesis characteristics and the relationship between reservoir compactness and oil-gas filling and reservoir formation are studied, the main controlling factors of relatively high quality reservoirs are revealed, and the comprehensive evaluation criteria for tight sandstone reservoirs in the study area are established. The reservoir is evaluated and forecasted. The results show that the Chang 8 reservoir in Jiyuan area is dominated by fine feldspar lithic sandstone and lithic feldspathic sandstone with high content of interstitial matter low maturity of the total composition of rock and moderate structural maturity. The average porosity and permeability of the reservoir are 8.67 and 0.46 脳 10 ~ (-3) 渭 m ~ (2), respectively. The pore structure of the reservoir can be divided into four types, and the type 鈪，

本文編號：1908968