發(fā)布時間：2018-07-04 10:32

  本文選題：筇竹寺組頁巖 + 五峰-龍馬溪組頁巖�。� 參考：《Applied Geophysics》2017年03期

【摘要】：四川盆地及其周緣地區(qū)的筇竹寺組和五峰-龍馬溪組頁巖是目前國內(nèi)頁巖氣勘探的主要層位之一,但其地震彈性性質(zhì)響應(yīng)規(guī)律的區(qū)域性特征需要開展相關(guān)的實驗和理論研究工作予以明確。本研究對干燥狀態(tài)下的筇竹寺組和五峰-龍馬溪組頁巖的露頭樣品進行了超聲波速度測試,系統(tǒng)地分析了地震彈性性質(zhì)隨頁巖巖石學(xué)特征的變化規(guī)律。研究結(jié)果表明,孔隙度與粘土礦物含量呈正相關(guān)、與脆性礦物含量呈負相關(guān);粘土、石英、長石和碳酸鹽構(gòu)成頁巖巖石基質(zhì),與孔隙共同構(gòu)成頁巖巖石骨架,而干酪根和黃鐵礦主要賦存于孔隙中,與頁巖骨架的耦合較弱。通過將全部連通性孔隙近似等效于僅存在于骨架粘土礦物之內(nèi)和采用Gassmann流體替換類似的思路處理干酪根和黃鐵礦,可以較為簡單地將自相容近似(SCA)理論、微分等效介質(zhì)模型(DEM)和Gassmann方程組合起來構(gòu)建研究區(qū)頁巖的地震巖石物理等效模型。該模型通過關(guān)鍵參數(shù)等效孔隙縱橫比(采用研究區(qū)樣品平均值或者由碳酸鹽含量進行估算)可以較為準(zhǔn)確地預(yù)測筇竹寺和五峰-龍馬溪組頁巖的縱波速度,驗證了等效模型的有效性和較廣的適用性,可為筇竹寺組和五峰-龍馬溪組頁巖氣儲層的測井解釋和地震"甜點"預(yù)測提供依據(jù)。
[Abstract]:The shales of Qiongzhusi formation and Wufeng Longmaxi formation in Sichuan Basin and its surrounding areas are one of the main strata of shale gas exploration in China at present. However, the regional characteristics of seismic elastic response need to be determined by relevant experiments and theoretical studies. The ultrasonic velocities of outcrop samples of Qiongzhusi formation and Wufeng Longmaxi formation in dry state were measured, and the variation of seismic elastic properties with the petrological characteristics of shale was systematically analyzed. The results show that porosity is positively correlated with clay mineral content and negatively correlated with brittle mineral content, clay, quartz, feldspar and carbonate constitute shale rock matrix, and together with pore form shale rock skeleton. Kerogen and pyrite mainly occur in pores, and the coupling between kerogen and shale skeleton is weak. By treating kerogen and pyrite using Gassmann fluid to treat kerogen and pyrite, it is easy to apply the theory of self-compatibility approximation (SCA) by approximating the total connected pores to the skeleton clay minerals only and using Gassmann fluid to replace the similar idea of kerogen and pyrite. The differential equivalent medium model (Dem) and Gassmann equation are combined to construct the seismic rock physical equivalent model of shale in the study area. The model can accurately predict the longitudinal wave velocities of Qiongzhusi and Wufeng Longmaxi formation shale by using the key parameter equivalent porosity ratio (using the average value of samples or estimating the carbonate content). The validity and wide applicability of the equivalent model are verified, which can provide the basis for logging interpretation of shale gas reservoirs in Qiongzhusi formation and Wufeng Longmaxi formation and prediction of seismic "dessert".
【作者單位】： 北京大學(xué)地球與空間科學(xué)學(xué)院造山帶與地殼演化教育部重點實驗室;地下信息探測技術(shù)與儀器教育部重點實驗室(中國地質(zhì)大學(xué)北京);
【基金】：sponsored by the National Natural Science Foundation of China(No.41274185 and 41676032)
【分類號】：P618.13;P631

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