伊通地堑五星潜山重点探井目的层失利原因分析

Analysis on failure causes of target layer for key exploratory wells
in Wuxing buried hill of Yitong graben

刘春杨 王营 卢双舫 张洋

东北石油大学，黑龙江 大庆 163000 中国石油大庆油田有限公司采油五厂，黑龙江 大庆 163000 中国石油大庆油田有限公司采油八厂，
黑龙江 大庆 163000 中国石油大学（华东），山东 青岛 266580 中国石油新疆油田油气储运分公司，新疆 克拉玛依 834000

井1井在目的层基岩内勘探失利，为查明失利原因，文中剖析了成藏条件。结果表明：研究区紧邻有利的生烃凹陷，目的层具有断层遮挡形成的良好圈闭，储层毗邻源岩具有优越的运移条件，储层评价证实基岩内存在好储层，因此，这些均不是该井失利的原因。然而在五星潜山上区域盖层双一段，泥岩内普遍发育裂缝，且其发育程度和现今在该区发现的油气藏数量具有负相关性，从而可以认为，盖层封闭性不好是失利的主要原因。为此，建议该区深层勘探应避开构造边部和泥岩相对较薄的地方。

Drilling failure is in the bedrock of target layer for Well 1. In order to solve this problem and identify the cause of failure, this paper analyzes the reservoir-forming condition. The result shows that the target layer has a good fault-structure trap and predominant migration condition because of reservoir abutting source rock and good reservoir in bedrock approved by reservoir evaluation and they are not the main factors of drilling failure. Fractures are ubiquitous in the first member mudstone of Shuangyang Formation which is regional cap rock on the Wuxing buried hill, and it presents negative correlation in amount between fractures and reservoirs found in this area. The research shows that the poor sealing of cap rock is the main reason of failure. It is suggested that deep exploration should avoid the tectonic boundary and relative thin mudstone layer in this region.

10.6056/dkyqt201304005