现代地质
現代地質
현대지질
Geoscience
2015年
5期
1110-1121
,共12页
侯颉%邹长春%曲璐%朱吉昌%李康%岳旭媛%彭诚%李宁
侯頡%鄒長春%麯璐%硃吉昌%李康%嶽旭媛%彭誠%李寧
후힐%추장춘%곡로%주길창%리강%악욱원%팽성%리저
三露天井田%冻土区%天然气水合物%测井响应特征%储层识别
三露天井田%凍土區%天然氣水閤物%測井響應特徵%儲層識彆
삼로천정전%동토구%천연기수합물%측정향응특정%저층식별
Sanlutian well field%permafrost region%gas hydrate%log response%reservoir identification
三露天天然气水合物钻探结果揭示,水合物主要赋存于裂隙型和孔隙型储层中。基于钻探结果,在测井岩性识别的基础上,综合利用常规测井和超声波成像测井等资料,总结两类天然气水合物储层的测井响应特征,形成了基于测井资料的水合物储层识别方法,并对该区储层进行划分。结果表明:(1)裂隙型水合物储层比纯泥岩层段的裂隙发育;声波速度较高,范围为1.5~4.5 km/s;电阻率最高可达90Ω·m。孔隙型水合物储层比砂岩水层的声波速度高,范围为2.0~4.0 km/s;电阻率亦为高值,范围为90~180Ω·m。(2)研究区14个钻孔共识别出裂隙型储层12层,孔隙型储层15层,总厚度为217.2 m。钻遇水合物的厚层均能识别,但少量钻遇的薄层未能识别,原因可能为薄层水合物含量少,导致测井响应不明显。总体上,测井方法在三露天天然气水合物储层识别方面应用效果良好。
三露天天然氣水閤物鑽探結果揭示,水閤物主要賦存于裂隙型和孔隙型儲層中。基于鑽探結果,在測井巖性識彆的基礎上,綜閤利用常規測井和超聲波成像測井等資料,總結兩類天然氣水閤物儲層的測井響應特徵,形成瞭基于測井資料的水閤物儲層識彆方法,併對該區儲層進行劃分。結果錶明:(1)裂隙型水閤物儲層比純泥巖層段的裂隙髮育;聲波速度較高,範圍為1.5~4.5 km/s;電阻率最高可達90Ω·m。孔隙型水閤物儲層比砂巖水層的聲波速度高,範圍為2.0~4.0 km/s;電阻率亦為高值,範圍為90~180Ω·m。(2)研究區14箇鑽孔共識彆齣裂隙型儲層12層,孔隙型儲層15層,總厚度為217.2 m。鑽遇水閤物的厚層均能識彆,但少量鑽遇的薄層未能識彆,原因可能為薄層水閤物含量少,導緻測井響應不明顯。總體上,測井方法在三露天天然氣水閤物儲層識彆方麵應用效果良好。
삼로천천연기수합물찬탐결과게시,수합물주요부존우렬극형화공극형저층중。기우찬탐결과,재측정암성식별적기출상,종합이용상규측정화초성파성상측정등자료,총결량류천연기수합물저층적측정향응특정,형성료기우측정자료적수합물저층식별방법,병대해구저층진행화분。결과표명:(1)렬극형수합물저층비순니암층단적렬극발육;성파속도교고,범위위1.5~4.5 km/s;전조솔최고가체90Ω·m。공극형수합물저층비사암수층적성파속도고,범위위2.0~4.0 km/s;전조솔역위고치,범위위90~180Ω·m。(2)연구구14개찬공공식별출렬극형저층12층,공극형저층15층,총후도위217.2 m。찬우수합물적후층균능식별,단소량찬우적박층미능식별,원인가능위박층수합물함량소,도치측정향응불명현。총체상,측정방법재삼로천천연기수합물저층식별방면응용효과량호。
In Sanlutian well field,the drilling results reveal that gas hydrate mainly occurs in the fractured and porous reservoirs.Based on the results of drilling and log lithology identification,by using conventional and ul-trasonic imaging log data,this article summarizes the log response characteristics of the both kinds of reservoirs respectively,and establishes identification methods which use log data to divide gas hydrate reservoirs in this ar-ea.The results show that:(1)compared to shale section,the fracture is developed,and sonic velocity is rela-tively high(in the range of 1.5 to 4.5 km /s)and the resistivity is up to 90 Ω·m in fractured gas hydrate reser-voirs;compared to the aqueous layer of sandstone,the acoustic velocity is of relatively high value in the range of 2.0 -4.0 km /s,the resistivity is also of relatively high value in the range of 90 -180 Ω·m in porous hydrate reservoirs.(2)12 layers of fractured reservoirs and 15 layers of porous reservoirs which have a total thickness of 217.2 m are identified in the 14 wells of the study area.All the thick drilling reservoirs can be identified except a small amount of thin ones,and the most possible reason is that log response is unobvious to less content of gas hydrate.Overall,the application effect of log methods is good at the identification of gas hydrate reservoirs in the Sanlutian well field.