武清凹陷大孟庄洼槽烃源岩地震属性预测与评价
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摘要
在缺少钻井资料的低勘探程度地区进行烃源岩评价和油气前景预测的难度较大。由于烃源岩与非烃源岩之间在平均振幅、平均能量等地震属性上存在明显差别,据此建立了一套利用层序地层学及地震地层学识别烃源岩,根据地震速度谱信息去除烃源岩体中砂质含量,由烃源岩体提取的地震属性与实测烃源岩有机碳含量等地化参数的对应关系,定量预测烃源岩有机碳含量的方法。利用该方法预测和评价了武清凹陷大孟庄洼槽沙三段中、下亚段和沙四段上亚段3个层系的烃源岩,其有机碳含量分布表现为西高东低,南高北低的特点,进而确定研究区南部的京24井—务古1井为有利的油气聚集区。
It is rather difficult to conduct source rock evaluation in low degree of exploration area for shortage of drill-well data. Based on differences in the average amplitudes and energies between the source rocks and non-source rocks, an estimating method for identification of the source rocks is established by research on the sequence and seismic stratigraphy on the seismic profiles, i. e. to remove sandy contents in the source rock interval by seismic velocity spectrum plot, to establish relationship between the seismic attributes and TOC contents measured from the source rocks, and to estimate the source rocks on the seismic profiles. Therefore, source rocks in the upper forth member, lower and middle third member of the Shahejie Formation are estimated by this method. The TOC contents are distributed in the studied area as "west high and east low, and south high and north low" , the belt in the southern studied area from well Jing-24 to well Wugu-1 is estimated as favorable place for oil and gas accumulation as high TOC contents in the source rocks.
It is rather difficult to conduct source rock evaluation in low degree of exploration area for shortage of drill-well data. Based on differences in the average amplitudes and energies between the source rocks and non-source rocks, an estimating method for identification of the source rocks is established by research on the sequence and seismic stratigraphy on the seismic profiles, i. e. to remove sandy contents in the source rock interval by seismic velocity spectrum plot, to establish relationship between the seismic attributes and TOC contents measured from the source rocks, and to estimate the source rocks on the seismic profiles. Therefore, source rocks in the upper forth member, lower and middle third member of the Shahejie Formation are estimated by this method. The TOC contents are distributed in the studied area as "west high and east low, and south high and north low" , the belt in the southern studied area from well Jing-24 to well Wugu-1 is estimated as favorable place for oil and gas accumulation as high TOC contents in the source rocks.
引文
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[15] 蔡超,朱炎铭,秦勇. 冀中坳陷武清凹陷苏 50 井石炭—二叠纪 煤系的成烃演化[J]. 地质科学,2008,43( 1) : 154 -161.
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[2] 黄第藩,李晋超. 陆相有机质演化和成烃机理[M]. 北京: 石油 工业出版社,1984: 7 -11.
[3] 金强,查明. 柴达木盆地西部第三系盐湖相有效烃源岩的识别 [J]. 沉积学报,2001,19( 1) : 125 -129.
[4] 王永刚,谢东,乐友喜. 地震属性分析技术在储层预测中的应 用[J]. 石油大学学报: 自然科学版,2003,27( 3) : 13 -23.
[5] 王永刚. 地震资料综合解释方法[M]. 东营: 中国石油大学出 版社,2007: 132 -160.
[6] 王友净,林承焰,董春梅,等. 大港滩海张东开发区沙河街组层 序地层格架与储层预测[J]. 油气地质与采收率,2007,14( 4) : 23 - 25.
[7] 刘震. 储层地震地层学[M]. 北京: 地质出版社,1997: 83 - 104.
[8] Vernik L,Liu Xingzhou. Velocity anisotropy in shales: A petrophys- ical study[J]. Geophysics,1997,62( 2) : 521 - 532.
[9] Vernik L,Nur A. Ultrasonic velocity and anisotropy of hydrocarbon source rocks[J]. Geophysics,1992,57( 5) : 727 - 735.
[10] 于建国,韩文功,于正军. 济阳坳陷孔店组烃源岩的地震预测 方法[J]. 石油地球物理勘探,2005,40( 3) : 318 -322.
[11] 朱玲,樊太亮. 密集段的识别标志及地质意义[J]. 石油与天然 气地质,1997,18( 2) : 161 -164.
[12] Klemme H D,Ulmshek G F. Effective petroleum source rocks of the world: stratigraphic distribution and controlling depositional factors [J]. AAPG Bulletin,1991,75( 12) : 1 809 -1 851.
[13] 朱光有,金强,张林晔. 用测井信息获取烃源岩的地球化学参 数研究[J]. 测井技术,2003,27( 2) : 104 -109.
[14] Passey Q R,Creaney S,Kulla J B. A practical model for organic richness from porosity and resistivity logs[J]. AAPG Bulletin, 1990,74( 12) : 1 777 - 1 794.
[15] 蔡超,朱炎铭,秦勇. 冀中坳陷武清凹陷苏 50 井石炭—二叠纪 煤系的成烃演化[J]. 地质科学,2008,43( 1) : 154 -161.
[16] 袁选俊,靳久强,孟庆仁. 冀中坳陷杨村斜坡结构成因及油气 成藏模式[J]. 石油学报,2004,25( 4) : 19 -22.
[17] 张以明,王余泉,刘井旺. 冀中坳陷复杂断块油藏成藏模式研 究[J]. 中国石油勘探,2006,11( 2) : 15 -18.
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