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首页> 外文学位 >Stratigraphy, depositional history, and hydrocarbon source-rock potential of the Upper Cretaceous - Lower Tertiary Moreno Formation, Central San Joaquin Basin, California.
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Stratigraphy, depositional history, and hydrocarbon source-rock potential of the Upper Cretaceous - Lower Tertiary Moreno Formation, Central San Joaquin Basin, California.

机译：加利福尼亚州圣华金盆地中部上白垩统-下第三系莫雷诺组的地层学，沉积史和烃源岩潜力。

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摘要

The Moreno Formation is a marine sedimentary sequence deposited in the central San Joaquin basin, California, during late Maastrichtian to middle Paleocene time (ca. 70-61 Ma). Facies sequences within the formation contain the following elements: a base-of-slope turbidite and channel sandstone facies; an oxygen-deficient lower to middle slope shale facies; an upwelling-related anoxic upper slope diatomaceous shale facies; and an upper slope to outer shelf sandstone and shale facies. Hence, the Moreno Formation records the shoaling of the south-central portion of the Great Valley forearc basin to shelf depths during latest Cretaceous to early Tertiary time.;Subsurface stratigraphic sections and isopach maps derived from study of borehole data reveal that a major shift in sediment supply to the basin accompanied the beginning of Moreno Formation deposition. Syndepositional uplift along the western margin of the basin accompanied the onset of the Laramide orogeny (ca. 75-45 Ma). The unique composition of a sandstone unit exposed in outcrop reveals the earliest known influx of Franciscan-derived detritus into the western San Joaquin basin, and suggests that portions of the uplifted western basin margin were exposed to erosion by mid-Maastrichtian time. The southward progradation of deltaic/shelf complexes resulted in the filling of the basin to shelf depths by middle Paleocene time.;Geochemical analyses of well core samples reveal a discrete partitioning of hydrogen-rich organic matter into fine-grained, laminated sediments within the Moreno sequence, whereas more oxidized organic matter characterizes non-laminated sediments. Organic facies favorable for the generation of liquid hydrocarbons exist within the Moreno in the southwestern portion of the study area, but maturity data are inconclusive. Biomarker analysis of oils from five producing wells in the San Joaquin basin and Vallecitos areas suggest that Moreno sediments were the source of at least two known petroleum accumulations.;Consideration of models of climate and oceanic circulation for the Late Cretaceous suggest that wind-driven, seasonal upwelling was responsible for increased diatom productivity in the San Joaquin basin in latest Cretaceous time, and was a major contributing factor in the development of anoxia in the basin.
机译：莫雷诺组是马斯特里赫特晚期至古新世中期（约70-61 Ma）期间在加利福尼亚州圣华金盆地中部沉积的海洋沉积层序。地层中的相序包含以下元素：坡底浊质和槽道砂岩相；下至中斜坡页岩相缺氧；与上升流有关的缺氧上坡硅藻质页岩相；外层砂岩和页岩相的上坡。因此，莫雷诺组记录了在白垩纪至第三纪早期大峡谷前盆地中南部的浅滩至陆架深度。;根据钻孔数据研究得出的地下地层剖面和等值线图表明，随着莫雷诺组沉积的开始，盆地的沉积物供应增加。沿盆地西缘的同沉积隆起伴随拉拉米德造山运动（大约75-45 Ma）的爆发。露头裸露的砂岩单元的独特组成揭示了方济各生的碎屑最早流入圣华金盆地西部，并表明隆起的西部盆地边缘的部分地区在马斯特里赫特时代就受到了侵蚀。三角洲/陆架复合体的向南发展导致盆地在古新世中期被填充到陆架深度。;井芯样品的地球化学分析显示，富氢有机质离散地分配为莫雷诺河内细颗粒的层状沉积物顺序，而氧化程度较高的有机物则是非层状沉积物的特征。研究区西南部的莫雷诺地区存在有利于液态烃生成的有机相，但成熟度数据尚无定论。对来自圣华金盆地和Vallecitos地区五个生产井的油进行的生物标记分析表明，莫雷诺沉积物是至少两种已知石油聚集的来源。对白垩纪晚期气候和海洋环流模型的研究表明，由风驱动，季节性上升是最近白垩纪圣华金盆地硅藻产量增加的原因，并且是盆地缺氧发展的主要因素。

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  • 作者

    McGuire, Douglas Joseph.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Geology.
  • 学位 Ph.D.
  • 年度 1988
  • 页码 331 p.
  • 总页数 331
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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