松辽盆地徐家围子断陷火山岩盖层封气能力综合定量评价

doi:10.7623/syxb201103008

石油学报 ›› 2011, Vol. 32 ›› Issue (3): 424-431.DOI: 10.7623/syxb201103008

松辽盆地徐家围子断陷火山岩盖层封气能力综合定量评价

史集建 1 吕延防 1 付广 1 李丽丽 2

1东北石油大学地球科学学院黑龙江大庆 163318； 2中国石油大庆油田有限责任公司勘探开发研究院黑龙江大庆 163712

收稿日期:2010-08-30 修回日期:2011-01-20 出版日期:2011-05-25 发布日期:2011-07-19
通讯作者: 史集建
作者简介:史集建，男， 1982年10月生，2009年获大庆石油学院硕士学位，现为东北石油大学在读博士研究生，主要从事油气藏形成与保存研究。
基金资助:
国家科技重大专项（2008ZX05007-003）资助。

Synthetically and quantitatively assessing gas-sealing ability of volcanic cap rocks in the Xujiaweizi Sag of the Songliao Basin

SHI Jijian 1 LÜ Yanfang 1 FU Guang 1 LI Lili 2

Received:2010-08-30 Revised:2011-01-20 Online:2011-05-25 Published:2011-07-19

摘要/Abstract

摘要：

对松辽盆地徐家围子断陷14个火山岩盖层气藏解剖研究表明，徐家围子断陷白垩系营城组一段顶部火山岩盖层具有高声波时差和井径扩容的特征，岩性主要为凝灰岩、火山角砾岩等，厚度为0~80 m，是一套良好的局部盖层。在分析火山岩盖层封气能力的影响因素，即火山岩厚度、排替压力、断层垂向封闭性、天然气黏度和气藏压力基础上，建立了火山岩封气能力综合评价方法，并得到天然气储量丰度与其火山岩盖层封气能力综合评价参数a具有正相关关系。结合天然气储量丰度的划分标准，得到徐家围子断陷形成高储量丰度气藏所需要的a值大于或等于0.005 m•Pa•s，形成中等储量丰度气藏所需要的a值为0.005～0.002 m•Pa•s，形成低储量丰度气藏所需要的a值为0.002～0.0003 m•Pa•s，形成特低储量丰度气藏所需要的a值小于0.0003 m•Pa•s。由此得到火山岩盖层封气能力分布特征:封闭高储量丰度气藏的火山岩盖层主要分布在徐家围子断陷东北部地区；封闭中等储量丰度气藏的火山岩盖层全区基本均有分布；封闭低储量丰度气藏的火山岩盖层主要分布在徐家围子断陷中部和南部地区，西北部也有局部分布；封闭特低储量丰度气藏的火山岩盖层在全区零星分布，主要处于火山岩盖层的尖灭线附近。徐家围子断陷天然气的富集在一定程度上受到火山岩盖层封气能力的控制。

关键词: 火山岩盖层, 封气能力, 综合评价, 营城组一段顶部, 储量丰度, 徐家围子断陷, 松辽盆地

Abstract:

The present paper studied 14 gas reservoirs in the Xujiaweizi rift Sag, Songliao Basin thoroughly and the result showed that volcanic rocks in the top of the first member of Yingcheng Formation, composed mainly of tuff and volcanic breccia with a thickness between 0 and 80 cm, were characterized by high interval transit time and enlarged borehole diameter, and locally formed a suite of good cap rocks. Consequently, a method was established for synthetically assessing gas-sealing ability of these volcanic rocks based on factors impacting on gas-sealing ability of volcanic cap rocks, such as, thickness, displacement pressure, vertical sealing of faults, viscidity of natural gases and pressure of gas reservoirs. A positive correlation was found between the reserve abundance of natural gases and the synthetic evaluation index a. According to a classification standard of gas-reserve abundances, the synthetic evaluation index a for gas reservoirs with high, medium, low or extra-low reserve abundances in the Xujiaweizi Sag, was greater than 0.005, form 0.005 to 0.002, from 0.002 to 0.0003 and less than 0.0003, respectively. Based on the distribution of gas-sealing ability of volcanic cap rocks drawn from this method, the paper demonstrated that volcanic cap rocks sealing reservoirs with high gas-reserve abundance were mainly distributed in the northeastern area, those with medium gas-reserve abundance widely distributed in the whole area, those with low gas-reserve abundance mainly dispersed in the middle and southern area and locally distributed in the northwest area, and those with extra-low gas-reserve abundance scattered in all the area, especially distributed in areas adjacent to pinchout lines of volcanic rocks, respectively. Therefore, the natural gas accumulation in the Xujiaweizi Sag was controlled, to a certain extent, by the gas-sealing ability of volcanic cap rocks.

Key words: volcanic cap rock, gas-sealing ability, synthetic evaluation, top of the first member of Yingcheng Formation; reserve abundance, Xujiaweizi Sag, Songliao Basin

史集建吕延防付广李丽丽. 松辽盆地徐家围子断陷火山岩盖层封气能力综合定量评价[J]. 石油学报, 2011, 32(3): 424-431.

SHI Jijian Lü Yanfang FU Guang LI Lili. Synthetically and quantitatively assessing gas-sealing ability of volcanic cap rocks in the Xujiaweizi Sag of the Songliao Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(3): 424-431.

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松辽盆地徐家围子断陷火山岩盖层封气能力综合定量评价

Synthetically and quantitatively assessing gas-sealing ability of volcanic cap rocks in the Xujiaweizi Sag of the Songliao Basin

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