渤海海域S低幅度构造区“低速陷阱”的成因及对策GENERATING FACTORS AND COUNTERMEASURES FOR “THE LOW-VELOCITY TRAP” IN THE LOW-AMPLITUDE STRUCTURES OF BOHAI SEA
谷志猛,吕丁友,李久,杨海风,边立恩
GU Zhimeng,L Dingyou,LI Jiu,YANG Haifeng,BIAN Li'en
摘要(Abstract):
渤海海域A凸起中段的S构造区表现出"双低"特征,即构造幅度低,圈闭面积小,属于低幅度构造,对速度变化异常敏感。在随钻过程中,通过合成地震记录、井震标定及时深关系等方式发现S3井与相距不足2 km的S1井、S2井时深关系差异明显,井震标定结果表明3口井同一地质分层在时间域的变化趋势与深度域相反,存在"跷跷板"现象,证实S3井区存在"低速陷阱"。综合理论研究、钻井资料、正演模拟结果等证实砂地比、油砂比均与平均速度呈负相关关系,是"低速陷阱"的主要影响因素。对目标区分层段拟合了平均速度的二元一次经验公式,通过层段累加进行深度预测,取得了良好的应用效果。
Structure S in Middle Salient A of Bohai Sea is characterized by low-amplitude structures and small traps. The structures are extremely sensitive to the changes of the velocity. During the measurement while drilling of Well S3,the time-depth relationships with Well S1 and S2 less than 2 km away are obviously different by means of the composite seismograms,well-seismic calibration,time-depth relationships and so forth. The calibration results show that for the three wells,even within the same geological layering,the variation trend in the time domain is inconsistent with that in the depth domain,i. e. there is"seesaw"phenomenon,thus proves that there is"lowvelocity trap / anomaly"in Well Block S3. The combination of the theoretical researches,drilling data,forward modeling achievements and so on show that there is the negative correlation between the sandstone-formation ratios,oil-sandstone ratios and average velocity,this is the main influencing factor resulted in the low-velocity anomaly.The binary first-power empirical formulas are matched for the average velocities interval by interval in the target block,and moreover the deep prediction is conducted by means of the interval accumulation,finally the much better practical effects are achieved.
关键词(KeyWords):
低幅度构造;“低速陷阱”;砂地比;油砂比;正演模拟;经验公式
low-amplitude structure;"low-velocity trap";sandstone-formation ratio;oil-sandstone ratio;forward modeling;empirical formula
基金项目(Foundation): 国家科技重大专项“近海隐蔽油气藏勘探技术”(2011ZX05023-002)
作者(Author):
谷志猛,吕丁友,李久,杨海风,边立恩
GU Zhimeng,L Dingyou,LI Jiu,YANG Haifeng,BIAN Li'en
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- 低幅度构造
- “低速陷阱”
- 砂地比
- 油砂比
- 正演模拟
- 经验公式
low-amplitude structure - "low-velocity trap"
- sandstone-formation ratio
- oil-sandstone ratio
- forward modeling
- empirical formula