車西洼陷陡坡帶沙三下亞段近岸水下扇儲(chǔ)層成巖演化及其對(duì)儲(chǔ)層物性影響
[Abstract]:Based on the data of core observation, thin casting, scanning electron microscope, cathodoluminescence and petrophysical properties testing, this paper discusses the nearshore underwater fan reservoir in the lower section of Sha3 submember in the steep slope zone of Chexi depression, Jiyang depression. The results show that the rock types of the nearshore subaqueous fan reservoirs in the Lower Sha 3 member of the Chexi sag are mainly composed of muddy complex supporting conglomerate, clastic supporting conglomerate, gravel sandstone, etc. Microscopically, lithic sandstone and feldspathic lithoclastic sandstone are the main ones. The highest content of hetero-group in plaster is up to 40%. The near-shore subaqueous fan reservoir in the lower member of Sha 3 in the Chexi sag is a typical type of ultra-low porosity and ultra-low permeability reservoir. Its average porosity and permeability are 3.42 脳 10 ~ (-3) 渭 m ~ (-3) 渭 m ~ (-2), respectively, but the abnormal high porosity zone is developed in the depth of 3 500 ~ 4 000 m. Porosity can reach 10. 2 and the reservoir space is mainly composed of corrosion pores and micro fractures. The reservoir in the study area has undergone a complicated diagenetic evolution process and is now in the middle diagenesis B stage. The diagenetic evolution sequence is as follows: compaction / carbonate cementation feldspar dissolution / carbonate cementation dissolution of quartz / carbonate cementation / recrystallization of plaster quartz / carbonate cement dissolution / carbonate cementation. The diagenetic evolution of different subfacies is different, in which the distal and middle fan front of fan braided waterway undergo multi-stage dissolution, and the reservoir physical properties are relatively good. The average porosity can reach 4.5% and 7.25% respectively, which is the "dessert area" of the underwater fan sand and gravel reservoir in the study area.
【作者單位】: 中國(guó)石化勝利油田地質(zhì)科學(xué)研究院;油氣資源與探測(cè)國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)石油大學(xué)(北京)地球科學(xué)學(xué)院;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(41272133) 國(guó)家科技重大專項(xiàng)專題(2011ZX05001-002-01)~~
【分類號(hào)】:P618.13
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