本文選題：須五段 + 致密氣藏��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：本文對(duì)新場(chǎng)地區(qū)須五段含氣儲(chǔ)層微觀結(jié)構(gòu)進(jìn)行系統(tǒng)研究,通過(guò)野外露頭、巖芯及測(cè)井資料的綜合分析,須五段的巖性主要為致密砂巖、粉砂巖及泥巖,發(fā)育砂夾泥、泥夾砂和砂泥巖三種組合類(lèi)型,具有陸相煤系地層有機(jī)質(zhì)類(lèi)型及熱演化特點(diǎn)。通過(guò)對(duì)其沉積相劃分,采集不同沉積相的樣品,采用偏光顯微鏡、掃描電鏡、激光共聚焦、納米CT掃描等技術(shù)刻畫(huà)砂巖和泥巖微觀結(jié)構(gòu)特征,用常規(guī)的手段測(cè)試須五段砂泥巖的物性,揭示須五段主要為超致密低-超低滲儲(chǔ)層。須五段砂巖儲(chǔ)集空間主要有溶蝕孔、晶間孔、有機(jī)質(zhì)孔和部分微裂縫,泥巖儲(chǔ)集空間主要有礦物溶蝕孔隙、粘土礦物晶間孔、晶內(nèi)孔和機(jī)質(zhì)納米孔,儲(chǔ)集空間在有機(jī)質(zhì)比較發(fā)育的層段,孔隙的連通性比較好,而其相對(duì)孤立的孔隙在空間不能夠形成有效的連通。儲(chǔ)集性能較好發(fā)育在須五段上亞段和下亞段。須五段的成巖作用主要有破壞性作用的壓實(shí)作用、膠結(jié)作用,及建設(shè)性作用的溶蝕作用和破裂作用,目前主要處于中成巖A期,部分進(jìn)入B期。綜合分析須五段沉積相和微觀結(jié)構(gòu)特征提出須五段儲(chǔ)集空間發(fā)育的主控因素,認(rèn)為分流河道和河口壩是須五段致密氣發(fā)育的有利儲(chǔ)集相帶,砂層與高碳泥巖配置是致密氣藏高產(chǎn)條件,富砂型的巖性組合為須五段提供了主要的儲(chǔ)集空間,脆性礦物及砂泥巖互層決定了儲(chǔ)層的可壓裂性能。長(zhǎng)石、方解石及巖屑等不穩(wěn)定碎屑顆粒在一定程度上阻止了成巖早-中期的壓實(shí)、壓溶作用,溶蝕改造作用造成了多種類(lèi)型的次生溶蝕孔隙,是低孔滲背景下優(yōu)質(zhì)儲(chǔ)層發(fā)育的重要因素。將須五段劃分為三類(lèi)儲(chǔ)集相帶:I類(lèi)區(qū),高能優(yōu)勢(shì)相帶內(nèi)、優(yōu)質(zhì)砂體厚度大、微裂縫發(fā)育、富含有機(jī)質(zhì)、含氣性好,水下分流河道砂體為骨架砂體,建設(shè)性成巖作用發(fā)育;II類(lèi)區(qū),高能優(yōu)勢(shì)相帶內(nèi)、優(yōu)質(zhì)砂體厚度較大、裂縫較發(fā)育、有機(jī)質(zhì)含量較高,水下分流河道砂體河口壩砂體為骨架砂體,有一定的含氣性;III類(lèi)區(qū),砂體累計(jì)厚度大、裂縫較發(fā)育,湖相灘壩砂體為主,有一定的含氣潛力。
[Abstract]:In this paper, the microstructures of five sections of gas bearing reservoirs in Xinchang area are systematically studied. Through the comprehensive analysis of field outcrop, core and log data, the lithology of the five segments is mainly composed of tight sandstone, siltstone and mudstone, and three combinations of sand sandwiched mud, mud grit and sand mudstone, with the organic matter type and thermal evolution of the continental coal strata. By dividing the sedimentary facies and collecting the samples of different sedimentary facies, using polarizing microscope, scanning electron microscope, laser confocal and nano CT scanning, the microstructural characteristics of sandstone and mudstone are characterized, and the physical properties of the five sections of sand mudstone are tested by conventional means, and the five sections are mainly super compact low ultra low permeability reservoirs. Five sections of sandstone are required. There are mainly dissolved pores, intergranular pores, organic pores and some micro cracks in the reservoir space. The reservoir space of the mudstone is mainly composed of mineral dissolution pores, intergranular pores of clay minerals, intragranular pores and nano pores, and the reservoir space is relatively well developed in the organic matter, and the relative isolation of pores can not be effective in space. The reservoir performance is well developed in the upper and lower subsections of the upper five segments. The diagenesis of the five sections is mainly composed of the compaction, cementation, and the dissolution and rupture of the constructive action. At present, it is mainly in the A period of the middle diagenesis and part of the B period. The comprehensive analysis must be characterized by five sections of sedimentary and microstructural features. The main controlling factors for the development of the five segment reservoir space are that the distributary channel and estuarine dam are favorable reservoir facies belts for the development of dense gas in the five segments, and the sand and high carbon mudstones are the high yield conditions for the dense gas reservoirs. The lithologic combination of the rich sand type provides the main reservoir space for the five segments, and the brittle minerals and the sand mudstone interbeds determine the reservoir. Fracture properties. The unstable debris particles such as feldspar, calcite and rock debris, to a certain extent, prevent the early and middle stage compaction of diagenesis, pressure dissolution and corrosion modification have resulted in a variety of types of secondary dissolution pores, which are important factors for the development of high quality reservoirs under low porosity and permeability background. The five segments are divided into three types of reservoir facies belts: high energy area and high energy In the dominant facies belt, high quality sand body thickness, micro fissure development, rich organic matter, good gas content, underwater distributary channel sand body as skeleton sand body, constructive diagenesis, high quality sand body thickness, high quality sand body thickness, high organic matter content and sand body of underwater distributary channel estuary dam as skeleton sand body in II area There is a certain degree of gas bearing; in the area III, the sand body is thicker, the fractures are more developed, and the beach bar sand bodies are the main types of lakes, with certain gas potential.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P618.13

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本文編號(hào)：1975435