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柴达木盆地第四系疏松砂岩地层生物气含气检测方法探讨

石油物探

2016年 55卷第No. 3期

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Title

The detection of biogas in unconsolidated sandstone formation of the Quaternary in Qaidam Basin

单位

(1.中国地质科学研究院地质力学研究所,北京100081;2.中国石油天然气股份有限公司勘探开发研究院廊坊分院,河北廊坊065007;3.中国石油天然气股份有限公司青海油田分公司勘探开发研究院,甘肃敦煌736200)

Organization

(1.Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;2.Langfang Branch,Research Institute of Petroleum Exploration and Development,CNPC,Langfang 065007,China;3.Exploration and Development Research Institute,Qinghai Oilfield,CNPC,Dunhuang 736200,China)

摘要

柴达木盆地三湖地区第四系具有疏松及砂泥岩薄互层等特点,如何利用地震信息开展生物气含气检测一直是该地区研究的重点和难点问题。在梳理研究区含气检测现状的基础上,分析了影响生物气含气检测的两大主要因素,即地层特征和地震反射特征,指出疏松砂岩地层含气之后,地震频率变化最明显,利用频率信息可更好地预测生物气藏,地震资料需要做好保护低频处理。在此基础上提出利用瞬时频率包络加权法预测生物气藏的新方法,并取得了较好的应用效果。

Abstract

The Quaternary in Sanhu Area of Qaidam Basin is characterized by unconsolidated and thin sand & shale interbedded.The detection of biogas by seismic information is always the focus and difficulty.Based on the current situation of biogas detection,we analyze the two main factors which influence the detection of biogas reservoirs,such as stratigraphic features and seismic reflection characteristics.The results reveal the seismic frequency changed most obviously when gas was saturated in the unconsolidated sandstone formation,so biogas can be better predicted using frequency information and the low frequency protection is necessary for seismic data processing.The method for predicting the biogas reservoir by using the instantaneous frequency envelope is proposed and achieved better application effect,which provides a useful technical means for the exploration of the Quaternary biogas pools in this area.

关键词：

第四系; 生物气; 含气检测; 疏松砂岩; 低频处理;

Keywords:

Quaternary,; biogas,; gas detection,; unconsolidated sandstone,; low frequency processing;

基金项目

DOI

10.3969/j.issn.1000-1441.2016.03.011