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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第7期    总第299期    2019年7月

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文章编号:1672-7207(2019)07-1626-11
东营凹陷陡坡带盐斜229地区沙四上亚段砂砾岩油藏成藏控制因素
解强旺1,王艳忠1,操应长1,王淑萍2,李宇志3,王欣3,李桥1,葸克来1,弭连山4,郭迎春5

(1. 中国石油大学 地球科学与技术学院,山东 青岛, 266580;
2. 中国石油大学 石油工业训练中心,山东 青岛, 266580;
3. 中国石化胜利油田分公司 东辛采油厂,山东 东营,257061;
4. 中国石化胜利油田分公司 胜利采油厂,山东 东营,257000;
5. 中国石化胜利油田分公司 勘探开发研究院,山东 东营,257000
)

摘 要: 东营凹陷盐斜229地区沙四上亚段埋深大于3 700 m近岸水下扇砂砾岩储层中发育大规模水层,与前期建立的“扇根封堵、扇中富集、扇缘疏导,中深层非油即干”的油气成藏理论矛盾。针对这一问题,通过地震剖面以及油藏剖面解释,综合运用薄片鉴定、阴极发光分析及荧光薄片观察等技术方法,对砂砾岩体的坡度、油水层展布、储集空间、成岩作用特征及差异性开展系统研究,总结砂砾岩油藏成藏控制因素。研究结果表明:储层以原生孔隙为主;碳酸盐胶结作用是主要的成岩事件。油层、水层和干层的储层特征存在差异,油层原生孔隙发育,碳酸盐胶结物含量少,以白云石胶结为主;水层及干层孔隙不发育,碳酸盐胶结物含量高,以铁白云石胶结为主。砂砾岩体的坡度控制早期石油充注的范围,早期石油充注抑制压实作用和晚期碳酸盐胶结作用,早期石油充注范围及运移路径决定晚期石油优先聚集区域。未发生早期石油充注的近泥岩部位碳酸盐胶结壳阻止晚期油充注,导致深层扇中发育大量水层。

 

关键词: 东营凹陷;砂砾岩体;砂砾岩体坡度;碳酸盐胶结物;石油成藏;控制因素

Control factors on the hydrocarbon accumulation of the Es4s reservoirs in Yanxie 229 area, Dongying Sag
XIE Qiangwang1, WANG Yanzhong1, CAO Yingchang1, WANG Shuping2, LI Yuzhi3, WANG Xin3, LI Qiao1, XI Kelai1, MI Lianshan4, GUO Yingchun5

1. School of Geosciences, China University of Petroleum, Qingdao 266580, China;
2. Oil Industry Training Center of China University of Petroleum, Qingdao 266580, China;
3. Dongxin Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257061, China;
4. Shengli Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257000, China;
5. Exploration and Development Research Institute of Shengli Oilfield Company, SINOPEC, Dongying 257000, China

Abstract:A large-scale water layer is developed in conglomerate reservoir of near-shore subaqueous fan in the Yanxie 229 area of Dongying Sag under the depth of 3 700 m. This is contradict with previous cognition that “Root fan can be used as caprock, oil is rich in middle fan, outer can be used as migration pathway, middle fan reservoirs is oil layer or dry layer”. Aiming at this problem, through seismic section and reservoir section interpretation, comprehensive application of thin-film identification, cathodoluminescence analysis and fluorescence observation, the slope of conglomerate body, distribution of oil and water layer, characteristics and differences of reservoir space and diagenesis were systematically studied. Control factors of petroleum accumulation in conglomerate reservoirs were summarized. The results show that primary pores are the main pore types. Carbonate cementation is the main diagenetic event. There are differences in reservoir characteristics in the oil layer, water layer and dry layer. Primary pores in the oil layer are developed, and the content of carbonate cementation is low, mainly dolomite cementation. The porosity of water layer and dry layer is not developed, and the content of carbonate cementation is high, mainly ankerite cementation. The area of early oil emplacement was controlled by the slope of conglomerate body. Compaction and late carbonate cementation is inhibited by early oil emplacement. Early oil emplacement range and migration path are the priority area of late oil accumulation. Carbonate cementation near mudstone where oil was not filled in early stage prevents oil charging in late stage, resulting in the development of large water layers in deep fan.

 

Key words: Dongying sag; glutenite; gradient of glutenite body; carbonate cement; oil accumulation; control factors

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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