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Calcite Cements in Burrows and Their Influence on Reservoir Property of the donghe sandstone, Tarim Basin, China

Journal of Earth Science 2012年第2期23卷 129-141页

作者：齐永安王敏郑伟李妲 Institute of Resources and Environment Henan Polytechnic University Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan Province Henan Polytechnic University

Abundant burrows of Skolithos linearis, Palaeophycus tubularis, and Taenidium barretti are preserved in the Upper Devonian donghe sandstone of Tarim basin, China. They are commonly highlighted in core by the color of the burrow fill in contrast to the surrounding matrix and have dif-ferent textures and fabrics from the matrix. There are three kinds of calcite cements in burrows, microcrystalline-crystalline calcite cement, mosaic calcite cement, and ferroan calcite cement. Microcrystalline-crystalline calcite cement is widely distributed in the lower part of the donghe sand-stone, but it is rare in burrows filling. It displays a globule structure under burial cementation and sel-dom replaces the quartz grains in shallow burial depth stage. Mosaiccalcite cement is widespread in the donghe sansdtone reservoir of North Tarim basin. It shows chrysoidine, orange and bright orange lu-minescence, and intensely replaces the quartz grains, forming in early diagenetic and shallow burial depth stage. Ferroan calcite is asymmetrically distributed in the donghe sandstone reservoir of Central Tarim basin. It fills the remanent pores in the shape of mosaic and replaces the quartz grains, matrix, and early calcite cement, forming in late diagenetic and deep burial depth stage. The burrows filled with white calcite cements have low oil saturation or may be oil-stained. In contrast, there is high oil saturation in the sandstone reservoir where the bioturbation is sparse or not present. With increased bioturbation, the porosity, permeability, and oil saturation decrease; thus, bioturbation intensity and reservoir property appear to be negatively correlated.

关键词： burrow calcite cement donghe sandstone reservoir property.

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donghe sandstone Subtle Reservoir Exploration and Development Technology in Hade 4 Oilfield

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Petroleum Science 2004年第2期1卷 35-43页

作者： SunLongde ZhouXinyuan SongWenjie JiangTongwen ZhuWeihong YangPing NiuYujie DiHongli TarimOilfieldBranchLtd PetroChinaKuerleXinjiang841000China

Hade 4 oilfield is located on the Hadexun tectonic belt north of the Manjiaer depression in the Tarim basin, whose main target layer is the donghe sandstone reservoir, with a burial depth over 5,000m and an amplitude below 34m, at the bottom of the Carboniferous. The donghe sandstone reservoir consists of littoral facies deposited quartz sandstones of the transgressive system tract, overlapping northward and pinching out. Exploration and development confirms that water-oil contact tilts from the southeast to the northwest with a drop height of nearly 80m. The reservoir, under the control of both the stratigraphic overlap pinch-out and tectonism, is a typical subtle reservoir. The donghe sandstone reservoir in Hade 4 oilfield also has the feature of a large oil-bearing area (over 130 km2 proved), a small thickness (average efficient thickness below 6m) and a low abundance (below 50 × 104t/km2). Moreover, above the target layer developed a set of igneous rocks with an uneven thickness in the Permian formation, thus causing a great difficulty in research of the velocity field. Considering these features, an combination mode of exploration and development is adopted, namely by way of whole deployment, step-by-step enforcement and rolling development with key problems to be tackled, in order to further deepen the understanding and enlarge the fruits of exploration and development. The paper technically focuses its study on the following four aspects concerning problem tackling. First, to strengthen the collecting, processing and explanation of seismic data, improve the resolution, accurately recognize the pinch-out line of the donghe sandstone reservoir by combining the drilling materials in order to make sure its distribution law; second, to strengthen the research on velocity field, improve the accuracy of variable speed mapping, make corrections by the data from newly- drilled key wells and, as a result, the precision of tectonic description is greatly improved; third

关键词： Hade 4 oil field donghe sandstone subtle reservoir seismic explanation tectonic description pinch-out line sequence stratigraphy water-oil contact

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A Study of Sedimentary Environment and Reservoir Quality of the Carboniferous donghe sandstonein the Tarim Basin

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Acta Geologica Sinica(English Edition) 1996年第4期70卷 395-406,454页

作者： Gu JiayuResearch Institute of Petroleum Exploration and Development, Beijing Research Institute of Petroleum Exploration and Development Beijing

Very thick, fine-grained quartzose sandstone of the Lower Carboniferous (called the donghe sandstone) was discovered in donghe-1 well in the Tarim basin. Highly-productive commercial oil and gas flows were obtained when a well completion test was conducted. This important discovery proved that the quartzose sandstone is a prospecting target with good prospects. After that, other two paying oil and gas flows were found in the Lower Carboniferous in the Tazhong-4 and Tazhong-10 structures (Tazhong means central Tarim), equivalent to the donghe sandstone. The Tazhong-4 structural oil field is the biggest oil field ever discovered. Therefore it is of guiding importance in oil and gas exploration to deepen the study of sedimentary and reservoir features and the sedimentary environment of the donghe sandstone and to build a sedimentary model in order to understand the reservoir distribution pattern.

关键词： donghe sandstone sedimentary facies sedimentary model tempestite pore type dissolved pore

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