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Sequence stratigraphic interpretation methods for low-accommodation, alluvial depositional sequences: Applications to reservoir characterization of Cut Bank field, Montana.

機(jī)譯：低容積沖積層序的層序地層解釋方法：在蒙大拿州庫特庫克油田的儲(chǔ)層表征中的應(yīng)用。

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In South Central Cut Bank Sand Unit (SCCBSU) of Cut Bank field, primary production and waterflood projects have resulted in recovery of only 29% of the original oil in place from heterogeneous, fluvial sandstone deposits. Using high-resolution sequence stratigraphy and geostatistical analysis, I developed a geologic model that may improve the ultimate recovery of oil from this field.;In this study, I assessed sequence stratigraphic concepts for continental settings and extended the techniques to analyze low-accommodation alluvial systems of the Cut Bank and Sunburst members of the lower Kootenai formation (Cretaceous) in Cut Bank field. Identification and delineation of five sequences and their bounding surfaces led to a better understanding of the reservoir distribution and variability.;Recognition of stacking patterns allowed for the prediction of reservoir rock quality. Within each systems tract, the best quality reservoir rocks are strongly concentrated in the lowstand systems tract. Erosional events associated with falling base-level resulted in stacked, communicated (multistory) reservoirs. The lowermost Cut Bank sandstone has the highest reservoir quality and is a braided stream parasequence. Average net-to-gross ratio value (0.6) is greater than in other reservoir intervals. Little additional stratigraphically untapped oil is expected in the lowermost Cut Bank sandstone. Over most of the SCCBSU, the Sunburst and the upper Cut Bank strata are valley-fill complexes with interfluves that may laterally compartmentalize reservoir sands. Basal Sunburst sand (Sunburst 1, average net-to-gross ratio ∼0.3) has better reservoir quality than other Sunburst or upper Cut Bank sands, but its reservoir quality is significantly less than that of lower Cut Bank sand.;Geostatistical analysis provided equiprobable representations of the heterogeneity of reservoirs. Simulated reservoir geometries resulted in an improved description of reservoir distribution and connectivity, as well as occurrences of flow barriers.;The models resulting from this study can be used to improve reservoir management and well placement and to predict reservoir performance in Cut Bank field. The technical approaches and tools from this study can be used to improve descriptions of other oil and gas reservoirs in similar depositional systems.

機(jī)譯：在Cut Bank油田的South Central Cut Bank砂場(chǎng)（SCCBSU）中，初級(jí)生產(chǎn)和注水項(xiàng)目?jī)H從非均質(zhì)的河流砂巖礦床中回收了僅29％的原始石油。我使用高分辨率層序地層學(xué)和地統(tǒng)計(jì)學(xué)方法，開發(fā)了一種地質(zhì)模型，可以改善該油田的最終采收率。在這項(xiàng)研究中，我評(píng)估了大陸性層序地層學(xué)概念，并擴(kuò)展了分析低容沖積的技術(shù)。 Cut Bank油田下庫特納伊組（白堊紀(jì)）的Cut Bank和Sunburst成員的系統(tǒng)。對(duì)五個(gè)層序及其邊界面的識(shí)別和劃定，使人們對(duì)儲(chǔ)層的分布和變異性有了更好的了解。層積模式的識(shí)別可以預(yù)測(cè)儲(chǔ)層的巖石質(zhì)量。在每個(gè)系統(tǒng)區(qū)域內(nèi)，質(zhì)量最好的儲(chǔ)層巖石強(qiáng)烈集中在低水位系統(tǒng)區(qū)域中。與基礎(chǔ)水位下降相關(guān)的侵蝕事件導(dǎo)致了堆積的，連通的（多層）儲(chǔ)層。最低的庫特河岸砂巖具有最高的儲(chǔ)層質(zhì)量，是辮狀河副帶。平均凈毛比值（0.6）大于其他儲(chǔ)層間隔。最下層的庫特班克砂巖預(yù)計(jì)幾乎沒有其他未開采的地層油。在SCCBSU的大部分地區(qū)，朝陽區(qū)和上切特河岸地層是山谷填充復(fù)合物，其間有縫隙，這些縫隙可能在橫向上將儲(chǔ)層砂隔開。基礎(chǔ)森伯斯特砂（森伯斯特1，平均凈毛比?0.3）比其他森伯斯特砂巖或上庫特河砂具有更好的儲(chǔ)層質(zhì)量，但其儲(chǔ)層質(zhì)量明顯低于下庫特河砂。儲(chǔ)層非均質(zhì)性的表征。模擬儲(chǔ)層的幾何形狀可以改善對(duì)儲(chǔ)層分布和連通性的描述，以及對(duì)流動(dòng)壁壘的描述。這項(xiàng)研究產(chǎn)生的模型可用于改善儲(chǔ)層管理和井位，并預(yù)測(cè)庫特河岸油田的儲(chǔ)層性能。這項(xiàng)研究的技術(shù)方法和工具可用于改進(jìn)對(duì)類似沉積系統(tǒng)中其他油氣藏的描述。

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作者
Ramazanova, Rahila.;
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Texas A&M University.;

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授予單位 Texas A&M University.;
學(xué)科 Geology.
學(xué)位 Ph.D.
年度 2006
頁碼 173 p.
總頁數(shù) 173
原文格式 PDF
正文語種 eng
中圖分類
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Sequence stratigraphic interpretation methods for low-accommodation, alluvial depositional sequences: Applications to reservoir characterization of Cut Bank field, Montana.

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