高有机质丰度泥岩压实的计算误区及定量校正方法
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摘要
文中以古龙凹陷青一段富有机质泥岩为例,应用平衡深度法对研究区目的层的孔隙流体压力分布进行了预测,重新认识了青一段异常压力分布规律,并探讨了源内泥岩油与超压的关系。结果表明:古龙凹陷青山口组压实曲线经过校正后,比正常压实趋势线斜率减小30.0%~42.0%;青一段由于有机碳质量分数较高,其欠压实的幅度降低最为明显,可达26.7%~40.0%。估算出的超压最大为6~8 MPa,反映该地区以前可能过高地估计了古龙凹陷青一段超压的幅度。因此,在前人研究的基础上,提出了消除有机碳对声波时差影响的方法。该方法能准确预测出地层压力,对其他地区富有机质泥岩压实趋势研究具有借鉴意义。
In this paper, taking the rich organic mudstone in the Member 1 of Qingshankou Formation of Gulong Depression as an example, used the equilibrium depth method, the pore fluid pressure distribution of the target layer in the study area was forecasted,the distribution law of abnormal pressure in the Member 1 of Qingshankou Formation is reanalyzed and the relationship between the shale oil in the source rock and overpressure is discussed. The results suggest that the slope of the normal compaction curve is reduced by about 30.0% -42.0% after the compaction curve of Qingshankou Formation in the Gulong Depression is corrected.Because of the high content of organic matter in the Member 1 of Qingshankou Formation, the decrease of the undercompacted amplitude curve is the most obvious, which can reach 26.7% -40.0%. The maximum of overpressure after correction is about 6 -8 MPa, reflecting the extent to which previous studies in the region may overestimate the overpressure to the Member 1 of Qingshankou Formation of Gulong Depression. Therefore, on the basis of previous studies, this paper proposes a method to eliminate the influence of organic matter on the acoustic time difference, which can accurately predict the formation pressure, and is useful for the study of the compaction trend of rich organic matter mudstone in other areas.
In this paper, taking the rich organic mudstone in the Member 1 of Qingshankou Formation of Gulong Depression as an example, used the equilibrium depth method, the pore fluid pressure distribution of the target layer in the study area was forecasted,the distribution law of abnormal pressure in the Member 1 of Qingshankou Formation is reanalyzed and the relationship between the shale oil in the source rock and overpressure is discussed. The results suggest that the slope of the normal compaction curve is reduced by about 30.0% -42.0% after the compaction curve of Qingshankou Formation in the Gulong Depression is corrected.Because of the high content of organic matter in the Member 1 of Qingshankou Formation, the decrease of the undercompacted amplitude curve is the most obvious, which can reach 26.7% -40.0%. The maximum of overpressure after correction is about 6 -8 MPa, reflecting the extent to which previous studies in the region may overestimate the overpressure to the Member 1 of Qingshankou Formation of Gulong Depression. Therefore, on the basis of previous studies, this paper proposes a method to eliminate the influence of organic matter on the acoustic time difference, which can accurately predict the formation pressure, and is useful for the study of the compaction trend of rich organic matter mudstone in other areas.
引文
[1]胡曦,王兴志,李宜真,等.利用测井信息计算页岩有机质丰度:以川南长宁地区龙马溪组为例[J].岩性油气藏,2016,28(5):107-112.
[2]李超,张立宽,罗晓容,等.泥岩压实研究中有机质导致声波时差异常的定量校正方法[J].中国石油大学学报(自然科学版),2016,3(40):77-87.
[3]张发强,王震亮,吴亚生,等.消除影响压实趋势线地质因素的方法[J].沉积学报,2002,20(2):326-331.
[4]林霖.烃源岩测井评价在银额盆地天草凹陷的应用[J].吐哈油气,2012,17(3):212-217.
[5]PASSEY Q R,CREANEY S,KULLA J B,et al.Practical model for organic richness from porosity and resistivity logs[J].AAPG Bulletin,1990,74(12):1777-1794.
[6]刘苍宇,辛仁臣.Δlog R方法在深水沉积物层序分析中的应用:以松辽盆地古龙凹陷古57井青山口组为例[J].岩性油气藏,2015,27(5):30-36.
[7]柳波,王蕃,冉清昌,等.松辽盆地北部青一段含油泥页岩储集特征浅析[J].岩性油气藏,2014,26(5):64-68.
[8]侯启军,冯子辉,邹玉良.松辽盆地齐家-古龙凹陷油气成藏期次研究[J].石油实验地质,2005,27(4):390-393.
[9]李捷,王海云.松辽盆地古龙凹陷青山口组泥岩异常高压与裂缝的关系[J].长春地质学院学报,1996,26(2):138-145.
[10]陈荷立,刘勇,宋国初,等.陕甘宁盆地延长组地下流体压力分布及油气运聚条件研究[J].石油学报,1990,11(4):8-16.
[11]潘树新,王天琦,田光荣,等.松辽盆地扶杨油层成藏动力探讨[J].岩性油气藏,2009,21(2):126-132.
[12]齐亚林,惠潇,梁艳,等.平衡深度法恢复鄂尔多斯盆地延长组过剩压力探讨[J].石油地质与工程,2014,28(5):20-22.
[13]陈曜岑.利用测井资料研究和评价生油岩[J].石油物探,1996,35(1):99-106.
[14]卢龙飞,蔡进功,刘文汇,等.泥岩与沉积物中黏土矿物吸附有机质的三种赋存状态及其热稳定性[J].石油与天然气地质,2013,34(1):16-27.
[15]孙波,蒋有录,石小虎,等.渤海湾盆地东濮凹陷压力演化与超压形成机制[J].中国石油大学学报(自然科学版),2013,27(2):28-35.
[16]TISSOT B P,WELTE D H.Petroleum formation and occurrence[M].New York:Springer-Vevlag Berlin Heidelberg,1984:131-159.
[17]OKIONGBO K S,APLIN A C,LARTER S R.Changes in typeⅡKerogen density as a function of maturity:evidence from the Kimmeridge clay formation[J].Energy and Fuels,2005,19(6):2495–2499.
[18]张润合,郑兴平,徐献高,等.鄂尔多斯盆地上三叠统延长组四、五段泥岩生烃潜力评价[J].西安石油大学学报(自然科学版),2003,18(2):9-14.
[19]王贵文,郭荣坤.测井地质学[M].北京:石油工业出版社,2001:10-30.
[20]左星,何世明,黄桢,等.泥页岩地层孔隙压力的预测方法[J].断块油气田,2007,14(1):24-27.
[2]李超,张立宽,罗晓容,等.泥岩压实研究中有机质导致声波时差异常的定量校正方法[J].中国石油大学学报(自然科学版),2016,3(40):77-87.
[3]张发强,王震亮,吴亚生,等.消除影响压实趋势线地质因素的方法[J].沉积学报,2002,20(2):326-331.
[4]林霖.烃源岩测井评价在银额盆地天草凹陷的应用[J].吐哈油气,2012,17(3):212-217.
[5]PASSEY Q R,CREANEY S,KULLA J B,et al.Practical model for organic richness from porosity and resistivity logs[J].AAPG Bulletin,1990,74(12):1777-1794.
[6]刘苍宇,辛仁臣.Δlog R方法在深水沉积物层序分析中的应用:以松辽盆地古龙凹陷古57井青山口组为例[J].岩性油气藏,2015,27(5):30-36.
[7]柳波,王蕃,冉清昌,等.松辽盆地北部青一段含油泥页岩储集特征浅析[J].岩性油气藏,2014,26(5):64-68.
[8]侯启军,冯子辉,邹玉良.松辽盆地齐家-古龙凹陷油气成藏期次研究[J].石油实验地质,2005,27(4):390-393.
[9]李捷,王海云.松辽盆地古龙凹陷青山口组泥岩异常高压与裂缝的关系[J].长春地质学院学报,1996,26(2):138-145.
[10]陈荷立,刘勇,宋国初,等.陕甘宁盆地延长组地下流体压力分布及油气运聚条件研究[J].石油学报,1990,11(4):8-16.
[11]潘树新,王天琦,田光荣,等.松辽盆地扶杨油层成藏动力探讨[J].岩性油气藏,2009,21(2):126-132.
[12]齐亚林,惠潇,梁艳,等.平衡深度法恢复鄂尔多斯盆地延长组过剩压力探讨[J].石油地质与工程,2014,28(5):20-22.
[13]陈曜岑.利用测井资料研究和评价生油岩[J].石油物探,1996,35(1):99-106.
[14]卢龙飞,蔡进功,刘文汇,等.泥岩与沉积物中黏土矿物吸附有机质的三种赋存状态及其热稳定性[J].石油与天然气地质,2013,34(1):16-27.
[15]孙波,蒋有录,石小虎,等.渤海湾盆地东濮凹陷压力演化与超压形成机制[J].中国石油大学学报(自然科学版),2013,27(2):28-35.
[16]TISSOT B P,WELTE D H.Petroleum formation and occurrence[M].New York:Springer-Vevlag Berlin Heidelberg,1984:131-159.
[17]OKIONGBO K S,APLIN A C,LARTER S R.Changes in typeⅡKerogen density as a function of maturity:evidence from the Kimmeridge clay formation[J].Energy and Fuels,2005,19(6):2495–2499.
[18]张润合,郑兴平,徐献高,等.鄂尔多斯盆地上三叠统延长组四、五段泥岩生烃潜力评价[J].西安石油大学学报(自然科学版),2003,18(2):9-14.
[19]王贵文,郭荣坤.测井地质学[M].北京:石油工业出版社,2001:10-30.
[20]左星,何世明,黄桢,等.泥页岩地层孔隙压力的预测方法[J].断块油气田,2007,14(1):24-27.