珠江口盆地东部地区预探井失利原因分析及启示

doi:10.3969/j.issn.1672-7703.2018.03.003

摘要/Abstract

摘要： 为了探究影响珠江口盆地东部地区勘探成效的因素，指导下一步的勘探工作，对该区所有失利预探井的失利原因进行了整体分析。研究结果表明，造成预探井失利的因素按所占比重从高到低依次为运聚匹配条件、圈闭条件、储层条件、烃源条件、盖层条件和保存条件；从水深、含油层系和圈闭类型3个角度对预探井的失利原因进行了分类分析，表明不同类别预探井的失利原因既存在共性也存在特性。共性：运聚匹配条件是造成预探井失利最多的因素，主要是运移指向和运移通道问题；其次是圈闭条件，主要是构造圈闭形态不落实和断层封堵问题；盖层和保存条件造成失利的情况较少。特性：深水区、深层、古潜山、岩性圈闭、地层圈闭及复合圈闭因储层条件而失利的情况比较突出，浅水区烃源和盖层问题占有一定的比例，断控圈闭因断层封堵差而失利的情况较多，岩性圈闭和构造-岩性圈闭的落实存在较大的风险等。在下一步勘探工作中，要强化运聚匹配条件和圈闭条件研究，对不同类别的目标，还应重点关注其突出的风险因素，开展针对性研究，降低风险。

关键词: 珠江口盆地东部地区, 预探井, 失利原因, 圈闭条件, 储层条件, 运聚匹配

Abstract: The causes of failed wildcat wells in the eastern Pearl River Mouth Basin were analyzed comprehensively to clarify the factors influencing the exploration results and guide the following exploration in this area. It is shown that the factors leading to the failure of wildcat wells are ranked as migration-accumulation matching condition, trap condition, reservoir condition, source rock condition, caprock condition and preservation condition according to their priorities. Then, the failure factors were classifed and analyzed from three aspects of water depth, oil bearing layer and trap type. It is indicated that the failure factors of different types of wildcat wells are similar in some aspects and different in other aspects. As for their similarities, migration-accumulation matching condition is the top one factor for the failure of wildcat wells, mainly referring to migration direction and migration pathway, trap condition takes the second place, including the uncertainty of structural trap form and the sealing of fault, and the failure caused by caprock and preservation conditions is less. The differences are as follows. The failure caused by reservoir condition is obvious in deepwater area, deep layer, buried hill, lithologic trap, stratigraphic trap and combination trap, while source rock and caprock occupy a certain proportion for the failure of wildcat wells in shallow water area. Besides, the failure caused by poor fault sealing is relatively common in fault control traps, and the confrmation of lithologic trap and structural-lithologic trap is faced with larger risks. In the following exploration, it is necessary to strengthen the researches on migration-accumulation matching condition and trap condition. And for different types of targets, it is also necessary to focus on the prominent risk factors and carry out the specifc study to reduce the risks.

Key words: the eastern Pearl River Mouth Basin, wildcat well, causes of the failure, migration-accumulation match, trap condition, reservoir condition

中图分类号:

张为彪, 易浩, 钟辉, 牛胜利, 徐徽, 冯轩, 陈玲玲, 郑洁. 珠江口盆地东部地区预探井失利原因分析及启示[J]. 中国石油勘探, 2018, 23(3): 18-27.

Zhang Weibiao, Yi Hao, Zhong Hui, Niu Shengli, Xu Hui, Feng Xuan, Chen Lingling, Zheng Jie. Analysis on the causes of failed wildcat wells in the eastern Pearl River Mouth Basin and its enlightenment[J]. China Petroleum Exploration, 2018, 23(3): 18-27.

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