本文選題：致密砂巖儲層預測　切入點：地震屬性　出處：《西南石油大學》2015年碩士論文　論文類型：學位論文

【摘要】：致密砂巖氣儲量豐富,產量高,是非常規(guī)氣勘探和開發(fā)取得效益的顯著增長點,它的研究和勘探開發(fā)將對未來天然氣工業(yè)的發(fā)展意義重大。蘇里格氣田已成為全國儲量最大且年產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,構造較簡單,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,儲集層展布較廣,但單砂體厚度相對小,橫向變化較快,縱向分布層次多,薄互層發(fā)育,氣水關系復雜,地震資料主頻偏低,頻帶寬度較窄,致使儲層預測具有較大的困難。 本文以蘇里格氣田盒8段致密砂巖儲層為研究對象,結合該區(qū)地震、測井、地質、鉆井、錄井等信息,采用三種方法進行儲層綜合預測。首先在統計過井儲層地震響應模式的基礎上,沿層提取刻畫河道砂體的疊后敏感屬性；其次使用波阻抗反演預測砂體的展布；結合AVO正演模擬,采用截距梯度交會解釋方法進一步對研究區(qū)含氣砂體的分布進行描述。最后綜合上述地震技術得到蘇里格59區(qū)盒8段地震儲層綜合平面預測結果,有效提高了預測的精度,取得了較好的效果。研究主要取得了以下成果： ①疊后資料過井剖面地震響應模式統計分析表明,盒8下儲層為兩峰夾一谷形態(tài),I類和II類井具有強波谷特征,III類井及水井為中波谷。由此利用該特點,沿地震層位提取了地震敏感屬性,而后對敏感屬性進行主成分分析,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于初始模型,忠實于地震數據,儲層阻抗響應模式為：盒83～盒84段內阻抗值為9150-10500g/cm3*m/s的低阻抗異常。 ③AVO厚層模型正演表明：蓋層條件會影響AVO類型,上覆高阻抗蓋層是研究區(qū)內產生Ⅳ類AVO的主要因素；含氣飽和度和蓋層條件固定時,截距越小儲層孔隙度越大；蓋層條件固定,孔隙度較小時梯度絕對值越大,含氣飽和度越高,當孔隙度較大時,梯度絕對值越小,截距絕對值越大含氣飽和度越高。 ④薄互層AVO數值模擬分析表明聲學介質條件下會出現假亮點,在彈性介質中進行數值模擬更為合理。 ⑤在厚層及薄互層AVO正演模擬的指導下,P-G交會屬性能較為準確的將III類和Ⅳ類有利區(qū)域結合起來,有效的預測出含氣砂巖發(fā)育帶,預測結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、鉆、測井、地震等多種信息,綜合運用屬性分析、反演及AVO技術,總結出一套切實可行的致密砂巖儲層綜合預測方法,為下一步井位部署和勘探開發(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：1581854