老油田剩余油分布——水下分流河道岔道口剩余油富集

doi:10.7623/syxb201105013

石油学报 ›› 2011, Vol. 32 ›› Issue (5): 829-835.DOI: 10.7623/syxb201105013

老油田剩余油分布——水下分流河道岔道口剩余油富集

林承焰 1 余成林 1 董春梅 1 王友净 1 刘卫 1 麻成斗 2 刘洪涛 2 宋彪 2

1中国石油大学油藏地质重点实验室山东青岛 266555； 2大庆油田有限责任公司第七采油厂黑龙江大庆 163517

收稿日期:2010-11-03 修回日期:2011-07-02 出版日期:2011-09-25 发布日期:2011-11-28
通讯作者: 林承焰
作者简介:林承焰，男，1963年9月生，1997年获中国石油大学博士学位，现为中国石油大学(华东)教授、博士生导师，主要从事储层地质学、油藏描述及剩余油研究。
基金资助:
国家科技重大专项（2011ZX05009-003）资助。

Remaining oils distribution in old oilfields：Enrichment of remaining oils in underwater distributary channel crotches

LIN Chengyan 1 YU Chenglin 1 DONG Chunmei 1 WANG Youjing 1 LIU Wei 1 MA Chengdou 2 LIU Hongtao 2 SONG Biao 2

Received:2010-11-03 Revised:2011-07-02 Online:2011-09-25 Published:2011-11-28

摘要/Abstract

摘要：

中国老油田已陆续进入开发中后期，大量剩余油因储层强非均质性的影响而滞留地下，成为了实现老油田稳产的重要物质基础。高含水条件下剩余油潜力区预测是一项高度综合性的研究难题，此相关领域的理论与实践一直在持续向前发展，但在对剩余油分布规律的认识上出现了简单化的趋势。通过对松辽盆地大庆油田外围的葡北油田葡Ⅰ油组剩余油分布规律的研究，除了通常对剩余油潜力区的认识之外，发现并提出了湖泊三角洲前缘水下分流河道的岔道口是一种新型的剩余油的有利富集区这一新认识，并从处于岔道口位置的油井开发响应和挖潜效果进行了剩余油分布定量评价。研究结果表明，从岔道口剩余油富集机制来看，该处储层特征具有明显特殊性，主要表现在：①砂体厚度相对较大；②夹层较发育；③沉积结构及组合类型复杂；④水下分流河道岔道口与水下分流主河道的主体部位直接连通。水下分流河道岔道口是一种以前研究中未曾提及的剩余油富集新领域，在该处聚集的剩余油属于首次发现。作为一种新的剩余油类型的提出，对与河流三角洲储层相关的剩余油挖潜具有重要的理论意义和实际价值。

关键词: 高含水期油田, 河流三角洲, 水下分流河道岔道口, 剩余油, 形成机制, 新领域

Abstract:

Old oilfields in China have successively entered into the middle to late stage of oil production. Affected by strong reservoir heterogeneity, large amounts of remaining oils are still resorted in the subsurface and they have laid an important material foundation for a long-term stable yield in old oilfields. However, it is a highly integrated research problem to predict potential areas of remaining oil accumulation under a high water cut condition, but attempts to make this prediction theoretically and practically have never ceased though the insight into distributional laws of remaining oils tends to be simplified. Through a study on distributional laws of remaining oils in the Pu-1 oil group of the Pubei Oilfield peripheral to the Daqing Oilfield, a new cognition was obtained, besides a common insight into potential areas of remaining oils, that an underwater distributary channel crotch in lake-facies delta front deposits could be a favorable place for remaining oil accumulation, thus, a quantitative assessment of remaining oil distributions was made based on the response of oil wells located in crotches to oil production and the effect of oil-producing potential exploitation. The study results indicated that in terms of the enrichment mechanism of remaining oils, this kind of reservoirs could be characterized by: ①a relatively larger thickness of sand body; ②well-developed interlayers; ③complex depositional structures and assemblage types; and ④a direct connection of distributary channel crotches with the main part of underwater main steam channels. The underwater distributary channel crotch is a potential location of remaining oil accumulation that has not yet been dealt with in previous studies and it is the first time to discover remaining oils accumulated in this place. Therefore, the discovery of this new type of remaining oil reservoirs is of great theoretic significance and practical value in exploiting the potential of remaining oils accumulated in reservoirs related to river-delta-facies deposits.

Key words: oilfield at high water-cut stage, fluvial delta, underwater distributary channel crotch, remaining oil, formation mechanism, frontier

林承焰余成林董春梅王友净刘卫麻成斗刘洪涛宋彪. 老油田剩余油分布——水下分流河道岔道口剩余油富集[J]. 石油学报, 2011, 32(5): 829-835.

LIN Chengyan YU Chenglin DONG Chunmei WANG Youjing LIU Wei MA Chengdou. Remaining oils distribution in old oilfields：Enrichment of remaining oils in underwater distributary channel crotches[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(5): 829-835.

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老油田剩余油分布——水下分流河道岔道口剩余油富集

Remaining oils distribution in old oilfields：Enrichment of remaining oils in underwater distributary channel crotches

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