摘要
渤海湾盆地车镇凹陷超压发育广泛,基于钻井实测（DST）资料和测井资料,对车镇凹陷地层超压特征及超压与油气的赋存关系进行了分析。研究结果表明,始新统沙河街组三段和四段地层发育异常高压,异常压力主要出现在埋深2 100m以下地层中,最大压力系数达到1.78。车镇凹陷泥岩声波时差对地层超压有较好的响应关系,在超压层段,声波时差明显偏离正常压实趋势,具有较高的声波时差值,通过典型单井泥岩声波时差确定了正常声波时差趋势线,并建立了地层压力预测模型,综合主要超压区域单井预测压力,分析了超压顶界面主要在2 100~3 200m之间,发育单超压系统。剖面上压力体分布特征表明,压力体形成以洼陷深部位为中心向周围逐渐递减的压力结构。超压对油气运移和赋存起着控制作用,套尔河洼陷油藏主要分布在压力系数为1.6的压力体外围;车西洼陷油藏主要分布在压力系数为1.4的压力体外围。
Overpressure in the Chezhen Depression of Bohai Bay Basin is widely developed. With drilling test （DST） data and logging data, an analysis of the relationships between overpressure characteristics and hydrocarbon enrichment in the Chezhen Depression shows that the three and four members of Eocene Sha- hejie Formation develops abnormaly high pressure with the maximum pressure coefficient of 1.78 below 2 100 m. The logging data illustrates that mudstone sonic logs have good response relationship in over- pressure zone, sonic transit time significantly deviates from the normal compaction trend with high acoustic time value. By setting up acoustic time trend line of typical wells, we establish a formation pressure pre- diction model. Intergrating measured and predicted pressure results show that Chezhen Depression devel- oped single overpressure system and the top overpressure interface is between 2 100--3 200 m. Hydrocar- bon migration and enrichment are controlled by overpressure. The oil reservoirs preserve outside the over- pressure bodies with pressure coefficient of 1.6 and 1.4 in Tao＇er River Depression and Chexi Depression respectively.
出处
《地质科技情报》
CAS
CSCD
北大核心
2015年第3期113-119,共7页
Geological Science and Technology Information
基金
国家油气重大专项"渤海湾盆地精细勘探关键技术"(2011ZX05006-002)
关键词
车镇凹陷
超压特征
预测
油气赋存
Chezhen Depression
overpressure characteristic
prediction
hydrocarbon enrichment
作者简介
金秋月（1988-），男，主要从事石油地质、成藏动力学方面的研究工作。Email：jinqy2@cnooc．com．cn
