渤海湾盆地青东凹陷古近纪烃源岩热演化史研究
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摘要
以地震、测井、录井及地球化学资料为基础,本文采用Easy-Ro方法对渤海湾盆地青东凹陷进行了古地温反演,计算了该地区的古地温梯度,并进一步利用人工取井和盆地模拟方法,确定了沙四上亚段和沙三下亚段烃源岩的成熟度和展布特征,预测了有利生烃区带的分布。结果表明,青东地区的古地温梯度为3.8℃/100m;沙四上亚段烃源岩的成熟度较高,进入成熟-高成熟阶段;沙三下亚段的烃源岩成熟度相对较小,为成熟-低成熟阶段;纵向上,沙四上亚段较沙三上亚段生烃范围大、烃源岩成熟度高;横向上,主要的生烃区带集中在青东凹陷主体洼陷地区(北部断阶带、北次洼、南次洼、中次洼)以及青南洼陷,青东凹陷西斜坡地区未进入生烃门限。
Based on seismic,logging and geochemical data,the Easy-Ro model was adopted to invert the paleogeothermal history of the Qingdong sag,and to calculate the paleogeothermal gradient.Based on data of artificial wells and thickness of the hydrocarbon source rocks,the maturity and distribution of the upper 4 th member and the lower 3 th member of the Shahejie Formation were discussed and the potential hydrocarbon generation zone was predicted.The results showed that the paleogeothermal gradient of the Qingdong Sag was 3.8℃/100m;the maturity of source rocks in the upper 4 th member of the Shahejie Formation was higher than that of the lower 3 th member of the Shahejie Formation which are in the stages of matureover mature and mature-low mature,respectively.In a vertical plane,the hydrocarbon generation domain and maturity of source rocks of the upper 4 th member of the Shahejie Formation was larger than those of the lower 3 th member of the Shahejie Formation,while in a plane,the main hydrocarbon zone are located on the main part of the Qingdong Sag(North fault-step,north sub-sag,middle sub-sag and south sub-sag) and the Qingnan subsag.The western slope of the Qingdong Sag did not reach the hydrocarbon generating threshold.
Based on seismic,logging and geochemical data,the Easy-Ro model was adopted to invert the paleogeothermal history of the Qingdong sag,and to calculate the paleogeothermal gradient.Based on data of artificial wells and thickness of the hydrocarbon source rocks,the maturity and distribution of the upper 4 th member and the lower 3 th member of the Shahejie Formation were discussed and the potential hydrocarbon generation zone was predicted.The results showed that the paleogeothermal gradient of the Qingdong Sag was 3.8℃/100m;the maturity of source rocks in the upper 4 th member of the Shahejie Formation was higher than that of the lower 3 th member of the Shahejie Formation which are in the stages of matureover mature and mature-low mature,respectively.In a vertical plane,the hydrocarbon generation domain and maturity of source rocks of the upper 4 th member of the Shahejie Formation was larger than those of the lower 3 th member of the Shahejie Formation,while in a plane,the main hydrocarbon zone are located on the main part of the Qingdong Sag(North fault-step,north sub-sag,middle sub-sag and south sub-sag) and the Qingnan subsag.The western slope of the Qingdong Sag did not reach the hydrocarbon generating threshold.
引文
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Qiu Nansheng and Wang Jiyang.1998.The use of free radicals oforganic matter to determine pale geothermal gradient[J].OrganicGeochemistry,28(1/2):77-86.
Sweeney J J and Burnham A K.1990.Evaluation of a simple model ofvitrinite reflectance based on chemical kinetics[J].AAPG Bulletin,4(10):1559-1570.
Shen X J,Wang Jian and Zhang J M.1994.Burial,thermal andmaturation histories simulation and oil-gas prospect prediction inQaidam Basin,Qinghai Province[J].Chinese Science Bulletin,39(9):824-828.
郭新安,吴智平,李伟,等.2010.青东地区新生代断层发育特征及其对沉积的控制作用[J].油气地质与采收率,17(4):13-15.
郭新安.2010.青东地区新生代盆地的发育与演化[D].青岛:中国石油大学(华东).
胡圣标,张容燕,周礼成.1998.油气盆地地热史恢复方法[J].勘探家,3(4):52-54.
刘丽,任战利.2007.东濮凹陷热演化史研究[J].石油勘探与开发,34(4):419-423.
李春荣,辛仁臣,李建平,等.2008.郯庐断裂对青东凹陷古近纪沉积体系的控制[J].新疆石油地质,29(2):209-213.
李桂范,李建平,王根照,等.2009.渤中坳陷青东凹陷古近系沙三下亚段构造-古地貌对沉积的控制[J].石油天然气与地质,30(4):426-429.
任战利.2000.中国北方沉积盆地热演化史的对比[J].石油与天然气地质,21(1):35-36.
付彩利.2005.楚雄盆地现今地温场特征分析与烃源岩热演化史恢复[D].西安:西北大学.
苏向光,邱楠生,柳忠泉,等.2006.济阳坳陷惠民凹陷热演化史分析[J].天然气工业,26(10):15-17.
时丕同,方旭庆,陈涛,等.2009.青东凹陷石油地质特征和勘探方向分析[J].西南石油大学学报(自然科学版),31(5):43-48.
王满.2010.松辽盆地北部上古生界热演化史恢复[D].长春:吉林大学.
王峻,刘家铎,田景春,等.2006.伊宁凹陷古地温恢复与热演化史研究[J].成都理工大学学报(自然科学版),16(33):577-580.
俞家声,王普伟,林玉祥.2001.青东凹陷油气资源潜力[J].油气地质与采收率,8(1):5-8.
肖卫勇,王良书,李华,等.2001.渤海盆地地温场研究[J].中国海上石油地质,02(5):18-23.
赵俊峰,刘池洋,刘永涛,等.2011.南华北地区上古生界热演化史恢复[J].石油勘探与开发,32(1):66-73.
周中毅,潘长春.1992.沉积盆地古地温测定方法及其应用[M].广州:广东科技出版社:225.
Green P F,Duddy I R,Gleadow A J W,et al.1989.Apatite fission trackanalysis as a pale temperature indicator for hydrocarbon exploration[A].Springer-Verlag New York.Inc.,181-195.
Crowley K D.1991.Thermal history of Michigan Basin and SouthernCanadian Shield from apatite fission track analysis[J].Geophys.Res,96(B1):697-711.
Lastett G M,Green P F,Duddy I R,et al.1987.Thermal annealing offission tracks in apatite(2):A quantitative analysis[J].ChemicalGeology,65:1-13.
Qiu Nansheng and Wang Jiyang.1998.The use of free radicals oforganic matter to determine pale geothermal gradient[J].OrganicGeochemistry,28(1/2):77-86.
Sweeney J J and Burnham A K.1990.Evaluation of a simple model ofvitrinite reflectance based on chemical kinetics[J].AAPG Bulletin,4(10):1559-1570.
Shen X J,Wang Jian and Zhang J M.1994.Burial,thermal andmaturation histories simulation and oil-gas prospect prediction inQaidam Basin,Qinghai Province[J].Chinese Science Bulletin,39(9):824-828.
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