致密碳酸鹽巖儲(chǔ)集層特征與天然氣勘探潛力——以鄂爾多斯盆地伊陜斜坡東部奧陶系馬家溝組為例
本文選題:鄂爾多斯盆地 切入點(diǎn):伊陜斜坡東部 出處:《石油勘探與開(kāi)發(fā)》2017年03期 論文類型:期刊論文
【摘要】:基于鉆井、試氣、分析化驗(yàn)等資料的綜合分析,對(duì)鄂爾多斯盆地伊陜斜坡東部奧陶系馬家溝組馬五_(1+2)亞段致密碳酸鹽巖儲(chǔ)集層特征及其成因進(jìn)行研究,并對(duì)天然氣勘探潛力進(jìn)行分析。研究提出致密碳酸鹽巖儲(chǔ)集層為孔隙度小于2%、滲透率小于0.1×10~(-3)mm~2的儲(chǔ)集體。伊陜斜坡東部馬五_(1+2)亞段致密碳酸鹽巖儲(chǔ)集層以含膏泥粉晶白云巖、泥粉晶白云巖及巖溶角礫白云巖為主,孔隙類型以裂縫-溶孔、裂縫-晶間孔為主,非均質(zhì)性強(qiáng),儲(chǔ)集層呈薄層大面積展布。奧陶系頂部不整合面構(gòu)造調(diào)整導(dǎo)致的儲(chǔ)集層"造孔"與"填孔"作用,以及埋藏期溶蝕增孔與沉積充填減孔共同作用是儲(chǔ)集層大面積致密化的主要原因。薄層白云巖致密儲(chǔ)集層與上覆廣覆式上古生界煤系烴源巖緊鄰形成大面積致密碳酸鹽巖氣成藏組合,含氣普遍,氣藏埋深淺(1 900~2 500 m),與上古生界致密砂巖氣組成立體含氣模式,因此鄂爾多斯盆地伊陜斜坡東部勘探開(kāi)發(fā)潛力大。
[Abstract]:Based on the comprehensive analysis of drilling, gas test and laboratory data, the characteristics and origin of dense carbonate reservoirs in the Mawujiagou formation of the Ordovician Majiagou formation in the eastern part of the Ordos Basin are studied. The gas exploration potential is analyzed. It is proposed that the tight carbonate reservoir is a reservoir with porosity less than 2 and permeability less than 0.1 脳 10 ~ (-3) mm ~ (-2). The dense carbonate rock reservoir in the eastern part of Yi-shan slope is composed of mud-bearing powdered dolomite. Mudstone dolomite and karst breccia dolomite are dominant. The pore types are fracture-dissolved pore, fission-intergranular pore, strong heterogeneity. The reservoir is distributed in a large area of thin layer. The effect of "pore making" and "filling hole" caused by the structural adjustment of the unconformable surface at the top of Ordovician, The main reason for the large area densification of the reservoir is the interaction of the corrosion increasing pore and the depositional filling and decreasing pore during the burial period. The compact reservoir of thin layer dolomite and the overlying and overlying source rock of coal measure of Upper Paleozoic formed a large area compact. Carbonate gas accumulation assemblage, The gas bearing is universal, the gas reservoir is buried in shallow depth of 1 900 ~ 2 500 m ~ (-1), and it forms a three-dimensional gas bearing model with the upper Paleozoic tight sandstone gas. Therefore, there is a great potential for exploration and development in the eastern part of the Yishan slope in the Ordos Basin.
【作者單位】: 中國(guó)石油長(zhǎng)慶油田公司勘探開(kāi)發(fā)研究院;低滲透油氣田勘探開(kāi)發(fā)國(guó)家工程實(shí)驗(yàn)室;成都理工大學(xué);長(zhǎng)江大學(xué);中國(guó)石油勘探開(kāi)發(fā)研究院;
【基金】:國(guó)家科技重大專項(xiàng)“大型油氣田及煤層氣開(kāi)發(fā)”(2016ZX05044)
【分類號(hào)】:P618.13
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