| 陕北东部地区长2+3油层组远源砂质辫状河沉积特征 |
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| 引用本文： | 王建民,吴昌荣.陕北东部地区长2+3油层组远源砂质辫状河沉积特征[J].矿物岩石,2007,27(4):92-97. |
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| 作者姓名： | 王建民 吴昌荣 |
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| 作者单位： | 1. 西安石油大学,陕西,西安,710065
2. 成都理工大学能源学院,四川,成都,610059 |
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| 基金项目： | 陕西省自然科学基础研究项目资助(编号:2006Z07) |
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| 摘 要： | 通过地表露头与钻井剖面的观测分析综合研究,证实陕北东部地区长2 3油层组属于在泛滥平原下游发育的远源砂质辫状河沉积。沉积类型可划分出河道亚相与泛滥平原亚相等两个亚相以及河床滞留、河道砂坝、天然堤、决口扇、泛滥平原等5个可识别的微相。河道砂坝为其沉积的主体。长3到长2期,远源砂质辫状河沉积在平面展布和剖面组合上均表现出向三角洲相区持续推进和逐步超覆的特点。远源砂质辫状河沉积在其平面相区内一般无明显的、限制性的河道表现,河道砂坝复合连片,形成大规模的砂坪或广泛分布的"叠覆泛砂体"沉积,泛滥平原发育区仅在局部有所残留;剖面组合上河道砂坝极为发育,复合迭加程度高,形成连续性和连通性良好的宽厚的复合河道砂坝砂体以及"砂包泥"的沉积组合。同时,远源砂质辫状河流的发育使得与其相邻的三角洲沉积具有了类似"辫状河三角洲"的性质和特点。
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| 关 键 词： | 陕北东部 长2 3油层组 远源砂质辫状河 沉积特征 |
| 文章编号： | 1001-6872（2007）04-0092-06 |
| 收稿时间： | 2007-06-04 |
| 修稿时间： | 2007-11-22 |
SEDIMENTARY CHARACTERISTICS OF FAR-RESOURCE SANDBRAIDED RIVER WITH LOW CURVATURE CHANNEL FOR THE CHANG 2+3 OIL RESERVOIR IN THE EAST OF SHAANXI PROVINCE |
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| WANG Jian-min,WU Chang-rong.SEDIMENTARY CHARACTERISTICS OF FAR-RESOURCE SANDBRAIDED RIVER WITH LOW CURVATURE CHANNEL FOR THE CHANG 2+3 OIL RESERVOIR IN THE EAST OF SHAANXI PROVINCE[J].Journal of Mineralogy and Petrology,2007,27(4):92-97. |
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| Authors: | WANG Jian-min WU Chang-rong |
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| Abstract: | Outcrop observation and drilling well section study revealed that Chang 2 3 oil layer in the northeast of Shaanxi province was resulted from the deposition of far-resource sand-braided river with low curvature channel.Its sedimentary type may be divided into two subfacies of river channel and flood plain,as well as five micro-facies types of riverbed lag deposit,channel sand dam,natural levee,crevasse splay and flood-plain,with the channel sand dam as the major deposition.From Chang 3 to Chang 2 stage,sedimentary distribution on surface and sedimentary association on cross section showed a characteristic durative propagation and stepwise overlap toward delta plain.Sedimentation of far-resource sand-braided river with low curvature channel lacks restrictive river channel,and channel sand dam forms large-scale sandy flat or overlap extensive sand body on surface with sedimentary province of flood-plain very restricted.River channel bar is well developed in the profile association,characterized by extensive superposition,wide and thick composite channel sand dam with good continuity and connectivity as well as the "sand enclosed mud" association.Meanwhile,the development of far-resource sand-braided river with low curvature channel of the Chang 2 3 affected the property and character of adjacent delta plain. |
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| Keywords: | northeast Shanxi Province Chang 2 3 oil layer sand-braided river with far-resource and low curvature channel sedimentary characteristics |
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