对油气藏潮汐重力勘探的探讨  

A study on oil and gas exploration using tidal gravity

作　　者：徐世浙[1] 肖锋[1,2] 余海龙[1] 李海侠[1] 龙大全[3] 

机构地区：[1]浙江大学地球科学系,杭州310027 [2]吉林大学地球探测科学与技术学院,长春130026 [3]中石化勘探开发研究院西部分院,乌鲁木齐830011

出　　处：《地球物理学进展》2008年第6期1657-1663,共7页Progress in Geophysics

摘　　要：利用油气藏潮汐重力异常直接找油是近年从俄罗斯引进的方法,但这一方法的原理在国内研究得很少,其有效性和可靠性还没有得到充分的论证.本文对油藏潮汐重力的形成机制、潮汐重力的观测和数据处理方法进行了研究.理论计算表明,油藏潮汐重力异常在微伽量级,而实际资料表明潮汐重力的观测误差为10μGal量级,油藏潮汐重力异常可能会被噪声淹没,所以没有观测到潮汐重力异常不等于地下没有油气;实际观测的潮汐重力异常可达数十μGal,即使超过观测误差的3倍,也不能将它直接归因于油藏产生的潮汐重力异常.例如:潮汐重力改正的误差可能达到数十μGal,对有效异常形成干扰.The method of oil and gas exploration using tidal gravity was recently introduced from Russia. There has been so far little research on its theoretical principle in China, and hence there has not been sufficient proof of the method＇s validity and reliability. We researched the formation of the reservoir tidal gravity, as well as the methodology of observation and processing of such gravity data. Theoretical calculation shows the anomaly of reservoir tidal gravity is measured atμGal level, while the measured data shows the observation error of such tidal gravity at 10-μGal level. This indicates that the data noise may well disguise real anomalies, and therefore that the lack of measured a- nomaly data does not necessarily equate to the lack of oil and gas reservoir underneath. The actual observed tidal gravity anomaly can reach tens of μGal. Though it is more than three times the observation error, we can not attribute it to the reservoir-induced tidal gravity anomaly. For example, the error during tidal gravity correction may reach tens of μGal, and therefore may disrupt the effective anomaly.

关 键 词：固体潮 潮汐重力异常 油气藏 

分 类 号：P312[天文地球—固体地球物理学] P631[天文地球—地球物理学]