德州凹陷古近系地层压力特征及油气运移方向
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摘要
德州凹陷是目前临清坳陷东部唯一获得工业油流的凹陷。综合利用泥岩声波时差、实钻速度及实测地层压力,分析了德州凹陷的地下流体压力场特征,该区存在泥岩欠压实和异常高压。由于压力是引起流体运动最明显的动力,可以判识油气运移的方向,尤其是异常压力差,为了确定该区的油气运移方向,利用地震层速度计算出德州凹陷古近系地层压力层速度,T_2与T_6反射层之间层速度最高值位于德1—德4井之间,为3 800m/s,结合该区流体势的最高值为10kJ/kg,计算出该区流体压力最高为35MPa,位于德1—德4井之间及德古1井东,因此,该区油气运移的主要方向是向德6—德1井区运移。
Dezhou sag is the only one which has gained commercial oil flow in the east part of Linqing depression.Characteristics of fluid pressure field are analyzed by acoustic time of mudstone,field velocity,and measured formation pressure,which indicates under-compaction in mudstone and abnormal pressure in this area.As pressure,particularly the abnormal pressure differential,is the most important force driving fluid to migrate,so,it can identify the direction of the petroleum migration.In order to recognize the direction of the petroleum migration,seismic horizon velocity is used to calculate the horizon velocity of Paleogene formation in Dezhou sag.It is shown that the maximal horizon velocity is 3 800 m/s between well Del and De4,and considering the fluid potential, whose maximum is 10 KJ/kg,the maximal fluid pressure of T_2-T_6 is 35 MPa,which locates between well De1,De4,and the east part of Degu1.It proves that the main direction of petroleum migration is from well De6 to De1.
Dezhou sag is the only one which has gained commercial oil flow in the east part of Linqing depression.Characteristics of fluid pressure field are analyzed by acoustic time of mudstone,field velocity,and measured formation pressure,which indicates under-compaction in mudstone and abnormal pressure in this area.As pressure,particularly the abnormal pressure differential,is the most important force driving fluid to migrate,so,it can identify the direction of the petroleum migration.In order to recognize the direction of the petroleum migration,seismic horizon velocity is used to calculate the horizon velocity of Paleogene formation in Dezhou sag.It is shown that the maximal horizon velocity is 3 800 m/s between well Del and De4,and considering the fluid potential, whose maximum is 10 KJ/kg,the maximal fluid pressure of T_2-T_6 is 35 MPa,which locates between well De1,De4,and the east part of Degu1.It proves that the main direction of petroleum migration is from well De6 to De1.
引文
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[2]王震亮.盆地流体动力学及油气运移研究进展[J].石油实验地质,2002,24(2):99-100.
[3]沈朴,张善文,林会喜,等.油气输导体系研究综述[J].油气地质与采收率,2010,17(4):4-8.
[4]倪金龙,王鹏,杜小亮,等.柴达木盆地西南部新生代构造样式及其动力学特征[J].油气地质与采收率,2009,16(1):9-12.
[5]盛秀杰,赵乐强,向立宏,等.济阳坳陷古近系一新近系地层油气藏油气输导方式[J].油气地质与采收率,2010,17(3):31- 33.
[6]付广,张艳梅.倾斜裂缝垂向封闭所需压力下限的确定方法及其应用[J].油气地质与采收率,2010,17(1):6-8,11.
[7]曾治平,刘魁元,宋国奇,等.车镇凹陷地层压力结构体系[J].油气地质与采收率,2009,16(3):18-21.
[8]操应长,徐涛玉,王艳忠,等.东营凹陷古近系储层超压成因及其成藏意义[J].西南石油大学学报:自然科学版,2009,31 (3):34-41.
[9]布瓦塞S.用地震反射振幅计算速度[J].胡钦安,译.石油地球物理勘探,1979,14(增刊2):75-84.
[10]赵桂萍.准噶尔盆地南缘异常高压及其与油气成藏的关系[J].石油与天然气地质,2003,24(3):327-331.
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