低渗透致密砂岩储层中石油微观赋存状态与油源关系——以鄂尔多斯盆地三叠系延长组为例

doi:10.11743/ogg20130302

石油与天然气地质 ›› 2013, Vol. 34 ›› Issue (3): 288-293.doi: 10.11743/ogg20130302

低渗透致密砂岩储层中石油微观赋存状态与油源关系——以鄂尔多斯盆地三叠系延长组为例

牛小兵^1,2, 冯胜斌^1,2, 刘飞^1,2, 王成玉^1,2, 郑庆华^1,2, 杨孝³, 尤源^1,2

1. 中国石油长庆油田分公司勘探开发研究院, 陕西西安 710018;
2. 低渗透油气田勘探开发国家工程实验室, 陕西西安 710018;
3. 中国石油长庆油田分公司油藏评价处, 陕西西安 710018

收稿日期:2012-06-28 修回日期:2013-01-08 出版日期:2013-06-28 发布日期:2013-07-17
作者简介:牛小兵(1977- ),男,高级工程师,石油地质与油藏评价。E-mail:nxb_cq@petrochina.com.cn。
基金资助:
中国石油天然气股份公司重大科技专项(2011E-2602);鄂尔多斯盆地大型岩性地层油气藏勘探开发示范工程(2008ZX05044)。

Microscopic occurrence of oil in tight sandstones and its relation with oil sources—a case study from the Upper Triassic Yanchang Formation, Ordos Basin

Niu Xiaobing^1,2, Feng Shengbin^1,2, Liu Fei^1,2, Wang Chengyu^1,2, Zheng Qinghua^1,2, Yang Xiao³, You Yuan^1,2

1. Research Institute of Petroleum Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China;
2. National Engineering Laboratory of Exploration and Development of Low Permeability Oil-Gas Fields, Xi'an, Shaanxi 710018, China;
3. Department of Reservoir Evaluation, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China

Received:2012-06-28 Revised:2013-01-08 Online:2013-06-28 Published:2013-07-17

摘要/Abstract

摘要： 明确低渗透储层孔隙分布及不同尺度孔隙中石油微观赋存状态是认识致密油特征的关键。应用核磁共振测试技术对鄂尔多斯盆地延长组低渗透致密砂岩储层进行研究,发现了鄂尔多斯盆地延长组低渗透致密砂岩储层普遍发育纳米孔隙,具大孔、中孔、小孔、微孔及纳米孔多尺度孔隙发育特征。通过对近源与远源油藏储层多尺度孔隙中石油的微观赋存状态分析,明确了近源油藏储层具从大孔到纳米孔隙连续性赋存石油特征,且微孔至纳米孔隙含油饱满;远源油藏储层石油有选择性地赋存在大至中孔隙中,纳米孔隙不含油。延长组7段(长7)生烃增压产生的异常压力,控制石油在具多尺度孔隙的低渗透致密砂岩储层中差异性赋存,这为认识盆地致密油分布规律提供了理论依据。由此指出长7烃源岩分布区的长8油层组上部、长7油层组和长6油层组下部致密砂岩是今后致密油研究和勘探开发的主要目标。

关键词: 核磁共振技术, 多尺度孔隙, 微观赋存状态, 致密油, 低渗透储层, 鄂尔多斯盆地

Abstract: Identifying pore distribution of tight reservoirs and the microscopic occurrence of oil in pores of different scales is critical to understand the characteristics of tight oil.In this study,tight sandstone samples from Yanchang Formation,Ordos Basin,were investigated through Nuclear Magnetic Resonance (NMR) experiment.Nano-scale pores are common in the tight sand of Yanchang Fm and macro-scale,medium-scale,small-scale,micro-scale and nano-scale pores co-exist in the samples.The microscopic occurrence of oil in multiple-scale pores are compared between near-source reservoir and far-source reservoir.In near-source reservoirs,oil exists in all kinds of pores and the micro-pores and nano-pores are saturated with oil.In contrast,in far-source reservoirs,oil selectively occur in macro-scale and medium-scale pores and nano-pores contains no oil.The abnormal pressure caused by hydrocarbon-generation in Chang 7 layer is believed to be the main controlling factor for different occurrences of oil in multi-scale pores in tight reservoir.This provides a theoretical basis for understanding the distribution of tight oil reservoir.It is concluded that the upper Chang 8,the Chang 7 and lower Chang 6 reservoirs within the distribution area of Chang 7 source rock are the main potential targets for tight oil exploration in the future.

Key words: Nuclear Magnetic Resonance, multi-scale pore, microscopic occurrence, tight oil, low permeability reservoir, Ordos Basin

中图分类号:

TE122.1

牛小兵,冯胜斌,刘飞,等. 低渗透致密砂岩储层中石油微观赋存状态与油源关系——以鄂尔多斯盆地三叠系延长组为例[J]. 石油与天然气地质, 2013, 34(3): 288-293. doi: 10.11743/ogg20130302 Niu Xiaobing,Feng Shengbin,Liu Fei,et al. Microscopic occurrence of oil in tight sandstones and its relation with oil sources—a case study from the Upper Triassic Yanchang Formation, Ordos Basin[J]. Oil & Gas Geology, 2013, 34(3): 288-293. doi: 10.11743/ogg20130302

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低渗透致密砂岩储层中石油微观赋存状态与油源关系——以鄂尔多斯盆地三叠系延长组为例

Microscopic occurrence of oil in tight sandstones and its relation with oil sources—a case study from the Upper Triassic Yanchang Formation, Ordos Basin

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