陆良盆地北部虾子沟岩性圈闭带含气性分析
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摘要
云南陆良地区天然气供不应求的矛盾十分突出,老区块生产能力急剧下降,寻找新区块提高供气能力十分必要。通过新三维地震手段发现了一批新的潜力含气区块,有必要对这些区块含气的可信度进行分析以提高勘探的经济效益。云南陆良盆地北部虾子沟地区是潜力含气区块之一。研究认为,该区储集层段砂体发育较好,圈闭类型以岩性圈闭为主,距生烃中心中部凹陷带较远。下伏烃源岩对上覆储集层的油气供应能力差,油气聚集条件差。随钻录井在无螺壳、煤、泥岩条带等含有物的砂岩中显示不活跃,地震亮点受砾石层干扰。综合分析结果表明,该地区的主要岩性圈闭油气富集条件差,勘探风险较大。
In Luliang area of Yunnan Province,gas demand exceeds its supply a lot and its productivity in old blocks decreases very rapidly.So,it is very essential to search for somenew blocks to increase gas supply.New potential gas-bearing blocks have been emerged through new 3D seismic technologies.Certainly,to analyze the gas-bearing creditability is significant to increase an exploration achievement and an economic benefit.Xiazigou area in northern Lulian Basin is a potential gas-bearingarea.After our research,we consider that,for the reservoir intervalin this area,its sand body develops very well,its trap is mainly lithologic one,and there is a far distance between the reservoir andthe central sag belt in hydrocarbon-generating center;in addition,the hydrocarbon-supplying capability of underlying source rock for overlying reservoir is poor and the hydrocarbon accumulation condition is also poor.Mud logging while drilling shows an in active in sandstone without shaly band,coal and snail shell,and seismic bright spot is interrupted by gravel bed.A comprehensive analysis indicates that this accumulation condition of main lithologic trap in the area is poor.So,its exploration risk is big.
In Luliang area of Yunnan Province,gas demand exceeds its supply a lot and its productivity in old blocks decreases very rapidly.So,it is very essential to search for somenew blocks to increase gas supply.New potential gas-bearing blocks have been emerged through new 3D seismic technologies.Certainly,to analyze the gas-bearing creditability is significant to increase an exploration achievement and an economic benefit.Xiazigou area in northern Lulian Basin is a potential gas-bearingarea.After our research,we consider that,for the reservoir intervalin this area,its sand body develops very well,its trap is mainly lithologic one,and there is a far distance between the reservoir andthe central sag belt in hydrocarbon-generating center;in addition,the hydrocarbon-supplying capability of underlying source rock for overlying reservoir is poor and the hydrocarbon accumulation condition is also poor.Mud logging while drilling shows an in active in sandstone without shaly band,coal and snail shell,and seismic bright spot is interrupted by gravel bed.A comprehensive analysis indicates that this accumulation condition of main lithologic trap in the area is poor.So,its exploration risk is big.
引文
[1]刘树根.陆良曲靖越洲盆地油气地质条件分析[R].成都:成都地质学院,1996.
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[2]张淮.陆良盆地三维地震资料综合解释研究[R].江苏:中国石化华东石油局,2003.
[3]李传亮,张景廉,杜志敏.油气初次运移理论新探[J].地学前缘,2007(4):132-141.
[4]翟光明.中国石油地质学[M].北京:石油工业出版社,2005.
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