Topic
Petroleum reservoir
About: Petroleum reservoir is a research topic. Over the lifetime, 5403 publications have been published within this topic receiving 83535 citations. The topic is also known as: petroleum deposit.
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84 citations
TL;DR: In this paper, a process-based depositional model was used to infer the origins of the sand-rich Yanchang Formation delta deposits in the Ordos Basin, China, and showed that interconnected delta-plain sand bodies lying above the lower sequence boundary of the Yanching Formation act as important migration pathways for oil, gas and other basin fluids, aids in exploration for stratigraphic and diagenetic traps in the delta plain area.
Abstract: Shallow‐lacustrine delta deposits of the Upper Triassic Yanchang Formation form the most important petroleum reservoir sandstone units in the Ordos Basin, China. Recent hydrocarbon exploration and outcrop studies demonstrated that shallow‐lacustrine sand‐rich deltas developed extensively along the gentle flanks and central part of the basin. The vertical succession of facies indicates that the Yanchang Formation records the entire lacustrine life cycle of the Late Triassic Ordos Basin. Four third‐order transgressive–regressive cycles and two larger shallow‐lacustrine deltaic cycles have been recognized. A process‐based depositional model, derived in part from the modern Ganjiang delta in Poyang Lake, China, is used to infer the origins of the sand‐rich lacustrine delta deposits. Slow basin subsidence, abundant sediment supply, autocyclic processes and a hydrologically open (overfilled) lake setting were the four main controls on the development of basin‐wide sand‐rich deltaic sequences. Recognition that inter‐connected delta‐plain sand bodies lying above the lower sequence boundary of the Yanchang Formation act as important migration pathways for oil, gas and other basin fluids, aids in exploration for stratigraphic and diagenetic traps in the delta plain area.
83 citations
TL;DR: In this article, the authors describe the correlation of hydrologic properties to porosity, a property that is well related to the lithostratigraphy and depositional and cooling history of the volcanic deposits and can be modeled to be distributed laterally.
Abstract: Determination of the suitability of Yucca Mountain, in southern Nevada, as a geologic repository for high-level radioactive waste requires the use of numerical flow and transport models. Input for these models includes parameters that describe hydrologic properties and the initial and boundary conditions for all rock materials within the unsaturated zone, as well as some of the upper rocks in the saturated zone. There are 30 hydrogeologic units in the unsaturated zone, and each unit is defined by limited ranges where a discrete volume of rock contains similar hydrogeologic properties. These hydrogeologic units can be easily located in space by using three-dimensional lithostratigraphic models based on relationships of the properties with the lithostratigraphy. Physical properties of bulk density, porosity, and particle density; flow properties of saturated hydraulic conductivity and moisture-retention characteristics; and the state variables (variables describing the current state of field conditions) of saturation and water potential were determined for each unit. Units were defined using (1) a data base developed from 4,892 rock samples collected from the coring of 23 shallow and 8 deep boreholes, (2) described lithostratigraphic boundaries and corresponding relations to porosity, (3) recognition of transition zones with pronounced changes in properties over short vertical distances, (4) characterization of the influence of mineral alteration on hydrologic properties such as permeability and moisture-retention characteristics, and (5) a statistical analysis to evaluate where boundaries should be adjusted to minimize the variance within layers. This study describes the correlation of hydrologic properties to porosity, a property that is well related to the lithostratigraphy and depositional and cooling history of the volcanic deposits and can, therefore, be modeled to be distributed laterally.
83 citations
TL;DR: In this article, the impact of sedimentary heterogeneities on performance of waterflooding in shallow marine reservoirs is investigated, and the relative influence of 12 heterogeneity factors is determined using experimental design and analysis of variance.
Abstract: This paper investigates the impact of sedimentary heterogeneities on performance of waterflooding in shallow marine reservoirs. Reservoir simulation models are developed from detailed geological models based on a four-level sedimentary architectural hierarchy ranging from sedimentary structures (wave ripples, hummocky cross-stratification) up to parasequences. Single- and two-phase flow properties are upscaled to capture the effects of small scale heterogeneities on performance. The relative influence of 12 heterogeneity factors is determined using experimental design and analysis of variance. The analysis identified large scale features (parasequence thickness and stacking patterns) to be of primary importance for waterflood performance. These features control the relative proportion of facies belts in the reservoir, which correlates with recovery. Other important, though secondary, heterogeneities include interfingering of facies belts, and small scale bedding.
82 citations
TL;DR: In this article, a 2D seismic analysis of the northwest Phu Khanh Basin, offshore Central Vietnam, based on 2-D seismic data, indicates that the initial rifting began during the latest Cretaceous? or Palaeogene controlled by left-lateral transtension along the East Vietnam Boundary Fault Zone (EVBFZ) and northwest-southeast directed extension east of the EVBFZ.
82 citations