本文選題：鄂爾多斯盆地　切入點(diǎn)：低滲透儲(chǔ)層　出處：《長(zhǎng)安大學(xué)》2017年碩士論文

【摘要】：鄂爾多斯盆地是我國(guó)最大的石油和天然氣勘探、開(kāi)發(fā)基地之一,目前盆地東部探明天然氣儲(chǔ)量已達(dá)上萬(wàn)億方。盆地東部上古生界地層發(fā)育齊全,具有較好的勘探潛力。但是該區(qū)儲(chǔ)層成巖作用復(fù)雜、儲(chǔ)層巖石力學(xué)性質(zhì)和內(nèi)部的構(gòu)造裂縫分布規(guī)律不明顯,這些因素是導(dǎo)致該區(qū)壓裂改造效果差的主要原因。為提高研究區(qū)氣藏壓裂改造效果,本論文針對(duì)佳縣—清澗地區(qū)主力含氣層系石盒子組盒8段和山西組山2段系統(tǒng)地開(kāi)展儲(chǔ)層巖相學(xué)、巖石力學(xué)性質(zhì)以及裂縫發(fā)育特征等方面的相關(guān)研究工作。取得的主要結(jié)論和認(rèn)識(shí)如下:1.通過(guò)巖相學(xué)觀察,將研究區(qū)上古生界低滲透儲(chǔ)層砂巖劃分成雜基蝕變充填強(qiáng)壓實(shí)致密成巖相、石英加大硅質(zhì)膠結(jié)粒間孔成巖相、未溶蝕鈣質(zhì)膠結(jié)交代致密成巖相、鈣質(zhì)膠結(jié)溶蝕孔成巖相、雜基溶蝕孔成巖相和巖屑溶蝕孔成巖相。。2.研究區(qū)儲(chǔ)層中不同成巖相砂巖的抗壓強(qiáng)度、彈性模量和泊松比均有所差異,脆性礦物含量、硅質(zhì)膠結(jié)物含量以及壓實(shí)重結(jié)晶程度越高的成巖相,則其抗壓強(qiáng)度越大,反之則越小;孔隙度越大的成巖相,彈性模量越小;石英等脆性礦物含量越高、壓實(shí)程度越弱、孔隙度越高的成巖相,則其泊松比越小,反之則越大。3.研究區(qū)儲(chǔ)層中不同成巖相砂巖的可壓裂性有一定的差異,脆性系數(shù)較大的石英加大硅質(zhì)膠結(jié)粒間孔成巖相、鈣質(zhì)膠結(jié)溶蝕孔成巖相和雜基溶蝕孔成巖相可壓裂性好,雜基蝕變充填強(qiáng)壓實(shí)致密成巖相和未溶蝕鈣質(zhì)膠結(jié)交代致密成巖相和巖屑溶蝕孔成巖相砂巖可壓裂性相對(duì)較差。4.研究區(qū)主要發(fā)育傾角大于60°的高角度剪性裂縫,且以近E-W向的裂縫最為發(fā)育。按照裂縫野外的交切關(guān)系可將其分為近E-W與近S-N向和NW-SE與NNE-SSW向兩套裂縫系統(tǒng)。近E-W與近S-N向裂縫系統(tǒng)指示了燕山期的構(gòu)造應(yīng)力場(chǎng),NW-SE與NNE-SSW向裂縫系統(tǒng)指示了印支期的構(gòu)造應(yīng)力場(chǎng)。壓裂人工造縫時(shí),應(yīng)避開(kāi)研究區(qū)較發(fā)育的裂縫系統(tǒng),避免壓裂施工時(shí)打開(kāi)原本存在的天然裂縫,從而使壓裂形成新的人工裂縫和裂縫網(wǎng)絡(luò),使壓裂效果顯著提升。
[Abstract]:Ordos Basin is one of the largest oil and gas exploration and development bases in China.The Upper Paleozoic strata in the eastern part of the basin are well developed and have good exploration potential.However, the diagenesis of reservoirs in this area is complicated, the mechanical properties of reservoir rocks and the distribution law of structural fractures in the reservoir are not obvious, these factors are the main reasons for the poor effect of fracturing reconstruction in this area.In order to improve the effect of fracturing in gas reservoirs in the study area, this paper systematically develops reservoir petrography for Shihezi formation No. 8 of the main gas-bearing strata in Jiaxin-Qingjian area and Shan2 member of Shanxi formation.Related research work on rock mechanical properties and fracture development characteristics.The main conclusions and understandings are as follows: 1.Through petrographic observation, the sandstone of low permeability reservoir of Upper Paleozoic in the study area can be divided into complex base alteration filling compacted tight diagenetic facies, quartz increasing siliceous cemented intergranular pore diagenetic facies, undissolved calcareous cemented metasomatic tight diagenetic facies.Calcareous cemented dissolution pore diagenetic facies, complex base dissolution pore diagenetic facies and lithic lithic dissolution pore diagenetic facies.The compressive strength, elastic modulus and Poisson's ratio of sandstone with different diagenetic facies are different in the study area. The higher the content of brittle minerals, the content of siliceous cementation and the degree of compaction recrystallization, the greater the compressive strength of the diagenetic facies.On the contrary, the smaller the diagenetic facies, the smaller the elastic modulus of the diagenetic facies with larger porosity, the higher the content of brittle minerals such as quartz, the weaker the compaction degree and the higher the porosity of diagenetic facies, the smaller Poisson's ratio is, and the larger. 3.The fracturing property of sandstone with different diagenetic facies is different in the study area. Quartz with high brittleness coefficient increases siliceous cemented intergranular pore diagenesis facies, calcareous cemented solution pore diagenetic facies and complex base dissolution pore diagenetic facies have good fracturing property.Compression-compacted dense diagenetic facies and undissolved calcareous cemented metasomatic tight diagenetic facies and lithic dissolution pore diagenetic sandstone have relatively poor fracturing ability .4.High angle shear fractures with dip angle greater than 60 擄are mainly developed in the study area, and those near E-W direction are the most developed.According to the intersecting relation of fracture field, it can be divided into two sets of fracture systems: near E-W and near S-N and NW-SE and NNE-SSW.The near E-W and near S-N fracture systems indicate the tectonic stress field of Yanshanian period. The NW-SE and NNE-SSW fracture systems indicate the tectonic stress field of the Indosinian period.In artificial fracturing, the developed fracture system in the study area should be avoided, and the existing natural fractures should be avoided during fracturing operation, so that new artificial fractures and fracture networks can be formed, and the fracturing effect can be greatly improved.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：P618.13

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