本文選題：致密砂巖儲(chǔ)層預(yù)測(cè)　切入點(diǎn)：地震屬性　出處：《西南石油大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：致密砂巖氣儲(chǔ)量豐富,產(chǎn)量高,是非常規(guī)氣勘探和開(kāi)發(fā)取得效益的顯著增長(zhǎng)點(diǎn),它的研究和勘探開(kāi)發(fā)將對(duì)未來(lái)天然氣工業(yè)的發(fā)展意義重大。蘇里格氣田已成為全國(guó)儲(chǔ)量最大且年產(chǎn)氣量最高的第一大氣田,它在致密砂巖氣研究中起舉足輕重的作用。59區(qū)位于蘇里格氣田西區(qū),鄂爾多斯盆地中北部,構(gòu)造較簡(jiǎn)單,為寬緩的西傾單斜。盒8段致密氣藏屬于地層巖性圈閉氣藏,主要為辮狀河沉積,儲(chǔ)集層展布較廣,但單砂體厚度相對(duì)小,橫向變化較快,縱向分布層次多,薄互層發(fā)育,氣水關(guān)系復(fù)雜,地震資料主頻偏低,頻帶寬度較窄,致使儲(chǔ)層預(yù)測(cè)具有較大的困難。 本文以蘇里格氣田盒8段致密砂巖儲(chǔ)層為研究對(duì)象,結(jié)合該區(qū)地震、測(cè)井、地質(zhì)、鉆井、錄井等信息,采用三種方法進(jìn)行儲(chǔ)層綜合預(yù)測(cè)。首先在統(tǒng)計(jì)過(guò)井儲(chǔ)層地震響應(yīng)模式的基礎(chǔ)上,沿層提取刻畫(huà)河道砂體的疊后敏感屬性；其次使用波阻抗反演預(yù)測(cè)砂體的展布；結(jié)合AVO正演模擬,采用截距梯度交會(huì)解釋方法進(jìn)一步對(duì)研究區(qū)含氣砂體的分布進(jìn)行描述。最后綜合上述地震技術(shù)得到蘇里格59區(qū)盒8段地震儲(chǔ)層綜合平面預(yù)測(cè)結(jié)果,有效提高了預(yù)測(cè)的精度,取得了較好的效果。研究主要取得了以下成果： ①疊后資料過(guò)井剖面地震響應(yīng)模式統(tǒng)計(jì)分析表明,盒8下儲(chǔ)層為兩峰夾一谷形態(tài),I類(lèi)和II類(lèi)井具有強(qiáng)波谷特征,III類(lèi)井及水井為中波谷。由此利用該特點(diǎn),沿地震層位提取了地震敏感屬性,而后對(duì)敏感屬性進(jìn)行主成分分析,客觀形象的描述了盒8段河道砂體的展布。 ②約束稀疏脈沖反演不依賴(lài)于初始模型,忠實(shí)于地震數(shù)據(jù),儲(chǔ)層阻抗響應(yīng)模式為：盒83～盒84段內(nèi)阻抗值為9150-10500g/cm3*m/s的低阻抗異常。 ③AVO厚層模型正演表明：蓋層條件會(huì)影響AVO類(lèi)型,上覆高阻抗蓋層是研究區(qū)內(nèi)產(chǎn)生Ⅳ類(lèi)AVO的主要因素；含氣飽和度和蓋層條件固定時(shí),截距越小儲(chǔ)層孔隙度越大；蓋層條件固定,孔隙度較小時(shí)梯度絕對(duì)值越大,含氣飽和度越高,當(dāng)孔隙度較大時(shí),梯度絕對(duì)值越小,截距絕對(duì)值越大含氣飽和度越高。 ④薄互層AVO數(shù)值模擬分析表明聲學(xué)介質(zhì)條件下會(huì)出現(xiàn)假亮點(diǎn),在彈性介質(zhì)中進(jìn)行數(shù)值模擬更為合理。 ⑤在厚層及薄互層AVO正演模擬的指導(dǎo)下,P-G交會(huì)屬性能較為準(zhǔn)確的將III類(lèi)和Ⅳ類(lèi)有利區(qū)域結(jié)合起來(lái),有效的預(yù)測(cè)出含氣砂巖發(fā)育帶,預(yù)測(cè)結(jié)果與井的吻合度較高,且能一定程度的區(qū)分氣井、水井及干井。 本次研究融合地質(zhì)、鉆、測(cè)井、地震等多種信息,綜合運(yùn)用屬性分析、反演及AVO技術(shù),總結(jié)出一套切實(shí)可行的致密砂巖儲(chǔ)層綜合預(yù)測(cè)方法,為下一步井位部署和勘探開(kāi)發(fā)提供參考。
[Abstract]:Dense sandstone gas is rich in reserves and high in production. It is a significant growth point for the benefit of unconventional gas exploration and development. Its research and exploration and development will be of great significance to the development of the natural gas industry in the future. Sulige gas field has become the largest gas field with the largest reserves and the highest annual gas production in the country. It plays an important role in the study of tight sandstone gas. Area 59 is located in the western part of Sulige gas field and in the central and northern part of Ordos basin. The reservoir is mainly braided river deposit, but the single sand body thickness is relatively small, the lateral change is faster, the longitudinal distribution level is many, thin interbed is developed, the gas-water relationship is complex, the main frequency of seismic data is low, and the band width is narrow. As a result, reservoir prediction is difficult. In this paper, the tight sandstone reservoir of Ke 8 member of Sulige gas field is taken as the research object, and the seismic, logging, geological, drilling, logging and other information in the area are combined. Three methods are used for comprehensive reservoir prediction. Firstly, the poststack sensitive attributes of channel sand bodies are extracted along the formation on the basis of statistical seismic response models of well-crossing reservoirs, and the distribution of sand bodies is predicted by wave impedance inversion. Combined with AVO forward modeling, the distribution of gas-bearing sand bodies in the study area is further described by means of intercept gradient intersection interpretation method. Finally, the comprehensive plane prediction results of seismic reservoir in Box 8 member of Sulige 59 area are obtained by synthesizing the above seismic techniques. The prediction accuracy is improved effectively and good results are obtained. The main results of the research are as follows:. (1) the statistical analysis of seismic response patterns in the cross-well profile of post-stack data shows that the reservoir below Box 8 has two peaks and one valley type I and type II wells with strong wave valley characteristics and well type III and wells as middle wave troughs. The seismic sensitive attributes are extracted along the seismic horizon, and then the principal component analysis of the sensitive attributes is carried out. The distribution of channel sand bodies in section 8 of the box is described objectively. 2 the constrained sparse pulse inversion is independent of the initial model and faithful to the seismic data. The reservoir impedance response model is the low impedance anomaly with the impedance value of 9150-10500g / cm ~ 3m / s in the 83-box 84 section. 3The forward modeling of AVO thick layer model shows that the caprock condition will affect the AVO type, the overlying high impedance capping is the main factor to produce type 鈪，

本文編號(hào)：1581854