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首頁> 外文學(xué)位 >Sequence stratigraphy, sedimentology and petroleum geology of the Glauconitic member and adjacent strata, Lower Cretaceous Mannville Group, southern Alberta.
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Sequence stratigraphy, sedimentology and petroleum geology of the Glauconitic member and adjacent strata, Lower Cretaceous Mannville Group, southern Alberta.

機(jī)譯：阿爾伯塔省南部下白堊統(tǒng)曼維爾組早古生統(tǒng)成員及其鄰近地層的層序地層學(xué)，沉積學(xué)和石油地質(zhì)學(xué)。

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摘要

The Lower Cretaceous Mannville Group forms part of the fill of the Cordilleran foreland basin in western Canada. Upper Mannville strata in the subsurface of the study area in southern Alberta accumulated on the cratonic side of the basin. Four upper Mannville lithostratigraphic units are informally recognized (in ascending order): Glauconitic member, and upper Mannville divisions A, B and C. Attention is focussed on the Glauconitic member and division A because many cores from oil and gas wells sample these units. Few cores sample division B, and none sample division C. The Glauconitic member and divisions A and B are differentiated based on sandstone composition, presence of valley fills, and nature of sedimentary structures, paleosols and coals.;Upper Mannville strata accumulated in coastal plain settings located landward of fully marine environments. Deposition evolved in response to changes in sediment supply and relative sea level. The Glauconitic member accumulated dominantly in estuarine environments, whereas divisions A, B and C accumulated dominantly in fluvial and deltaic environments. The change in depositional setting coincided with a change in sandstone composition from quartzose to lithofeldspathic. These changes occurred because sediment influx from the orogenic belt began to outstrip accommodation in this part of the foreland basin, and the boreal sea concomitantly regressed generally northward.;Valley fills and paleosols in the Glauconitic member and division A indicate the presence of unconformity bounded sequences that formed through numerous cycles of fluvial incision and subaerial exposure followed by aggradation. These cycles, which are interpreted to have been induced by fluctuations of relative sea level, resulted in significant changes in coastal plain deposition. The Glauconitic member accumulated in inner estuarine environments that were confined within valleys when sea level was low, and in outer estuarine bays that covered interfluves when sea level was high. Division A accumulated in fluvial channels that were confined within valleys when sea level was low, and in shallow deltas that covered interfluves when sea level was high.;Most of the oil produced in the study area comes from the Glauconitic member. Reservoir sandstones in valley fills are thick, elongate pods that formed from longitudinal bars when inner estuarine deposition was confined within valleys. Reservoir sandstones outside valley fills are thin sheets that formed from coalesced sand shoal and tidal channel deposits when outer estuarine bays spread across interfluvial areas adjacent to the valleys. Common updip seals for both types of reservoirs are formed by (1) intrasequence facies changes from sandstone to shale, and (2) younger, cross-cutting valley fills in division A which contain low-permeability lithofeldspathic sandstone.
機(jī)譯：下白堊統(tǒng)曼維爾群是加拿大西部科迪勒蘭前陸盆地的一部分。艾伯塔省南部研究區(qū)地下的上曼維爾地層堆積在盆地克拉通一側(cè)。非正式地（按升序排列）確認(rèn)了四個較高的曼維爾巖石地層學(xué)單元：青釉巖成員，以及上曼恩維爾區(qū)A，B和C。注意力集中在Glauconitic成員和A區(qū)，因?yàn)槭秃吞烊粴饩脑S多巖心都對這些單元進(jìn)行了采樣。巖心樣本B很少，而C樣本則沒有。根據(jù)巖體成分，谷底填充物的存在以及沉積結(jié)構(gòu)，古土壤和煤的性質(zhì)，區(qū)分了青岡成員和A和B區(qū)域;沿海平原上的曼維爾上層地層設(shè)置位于完全海洋環(huán)境的陸地上。沉積物隨沉積物供應(yīng)量和相對海平面的變化而演變。古生紀(jì)成員主要在河口環(huán)境中積累，而A，B和C分區(qū)主要在河流和三角洲環(huán)境中積累。沉積環(huán)境的變化與砂巖成分從石英質(zhì)到巖石長石質(zhì)變化相吻合。發(fā)生這些變化的原因是造山帶中的沉積物流入開始超出前陸盆地這一部分的容納范圍，并且北海也隨之總體向北退縮。；古生紀(jì)成員和A區(qū)的谷粒充填和古土壤表明存在不整合的有界序列它是由無數(shù)次的河床切開和暴露于動脈下并隨后凝集形成的。這些循環(huán)被解釋為是由相對海平面的波動引起的，導(dǎo)致沿海平原沉積物發(fā)生了重大變化。古青紀(jì)成員聚集在河口較低的內(nèi)部河口環(huán)境中，而當(dāng)海平面較高時則在覆蓋河床的河口外區(qū)域中。 A區(qū)在海平面低時聚集在河道中，而海平面高時則聚集在淺三角洲中，并覆蓋了干擾物。A區(qū)；研究區(qū)產(chǎn)生的大部分油來自青岡巖系。山谷填充物中的儲層砂巖是厚而細(xì)長的豆莢，當(dāng)內(nèi)部河口沉積物限制在山谷中時，由縱筋形成。谷粒填充物外的儲層砂巖是薄薄的薄片，當(dāng)外部河口灣分布在與谷粒相鄰的河床間區(qū)域時，由聚結(jié)的淺灘和潮汐河道沉積物形成。兩種類型油藏的共同上傾封閉是由（1）從砂巖到頁巖的層內(nèi)相變化和（2）A區(qū)中較年輕的橫切谷填充物形成的，這些填充物中含有低滲透性巖石長石質(zhì)砂巖。

著錄項(xiàng)

  • 作者

    Wood, James Michael.;

  • 作者單位

    University of Calgary (Canada).;

  • 授予單位 University of Calgary (Canada).;
  • 學(xué)科 Geology.
  • 學(xué)位 Ph.D.
  • 年度 1990
  • 頁碼 370 p.
  • 總頁數(shù) 370
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類
  • 關(guān)鍵詞

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