黄骅坳陷沧东凹陷孔店组石油资源潜力及勘探方向
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摘要
渤海湾盆地黄骅坳陷沧东凹陷的主要烃源岩层系为古近系孔店组二段,它生成的油气主要富集于孔店组和沙河街组储层中。在石油地质条件综合分析的基础上,以孔二段优质烃源岩为核心,建立了源上孔一段构造-岩性油藏、源侧孔二段地层-岩性油藏和源内页岩油等3种成藏模式。采用改进的成因法进行常规油与页岩油资源评价,其核心思想是用剥离计算的生烃量、排烃量及残留烃量进行约束,采用多参数类比法计算运聚系数并评价常规油资源,采用质量含油率法评价页岩油资源。评价结果表明:沧东凹陷孔店组常规石油资源量约为6.9×10~8 t,页岩油资源量约为6.8×10~8 t;孔店组剩余石油资源分布在源上孔一段构造-岩性油藏、中低斜坡区地层-岩性油藏和湖盆中心区页岩油等3大领域。页岩油资源潜力巨大,是未来最主要的勘探接替领域。
The Kongdian Member-2 of the Paleogene is the main source rock series in Cangdong Sag, Huanghua Depression in Bohai Bay Basin. The oil and gas generated by it are mainly concentrated in the reservoirs of Kongdian Formation and Shahejie Formation. Based on analysis of comprehensive petroleum conditions, three reservoir-forming patterns, i.e. structurallithologic reservoir in Kong member-1 above source rocks, stratigraphic-lithologic reservoir in Kong member-2 beside source rocks and shale oil in source rocks, have been established with high-quality source rocks as the key factor. The improved genesis method is used to evaluate the conventional oil and shale oil resources with the calculated amounts of the generated,expulsion and residual hydrocarbons based on experiment as constraint. The multi-parameters analogy method is used to calculate the migration and accumulation coefficient and then evaluate the conventional oil resources. The quality-oil-content method is used to evaluate the shale oil resources. The results show that the amounts of conventional oil resources and shale oil resources of Kongdian Formation in Cangdong Sag are about 6.9×10~8 t and 6.8×10~8 t respectively, and the remaining oil resources of Kongdian Formation are distributed in three major fields, namely, structural-lithologic reservoirs in Kongdian Member-1, stratigraphic-lithologic reservoirs in middle-low slope areas and shale oil in the central area of the lake basin. The potential of shale oil resources is huge, and it will be the main exploration fileds in the future.
The Kongdian Member-2 of the Paleogene is the main source rock series in Cangdong Sag, Huanghua Depression in Bohai Bay Basin. The oil and gas generated by it are mainly concentrated in the reservoirs of Kongdian Formation and Shahejie Formation. Based on analysis of comprehensive petroleum conditions, three reservoir-forming patterns, i.e. structurallithologic reservoir in Kong member-1 above source rocks, stratigraphic-lithologic reservoir in Kong member-2 beside source rocks and shale oil in source rocks, have been established with high-quality source rocks as the key factor. The improved genesis method is used to evaluate the conventional oil and shale oil resources with the calculated amounts of the generated,expulsion and residual hydrocarbons based on experiment as constraint. The multi-parameters analogy method is used to calculate the migration and accumulation coefficient and then evaluate the conventional oil resources. The quality-oil-content method is used to evaluate the shale oil resources. The results show that the amounts of conventional oil resources and shale oil resources of Kongdian Formation in Cangdong Sag are about 6.9×10~8 t and 6.8×10~8 t respectively, and the remaining oil resources of Kongdian Formation are distributed in three major fields, namely, structural-lithologic reservoirs in Kongdian Member-1, stratigraphic-lithologic reservoirs in middle-low slope areas and shale oil in the central area of the lake basin. The potential of shale oil resources is huge, and it will be the main exploration fileds in the future.
引文
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[22]徐祖新,姜文亚,张义杰,等.渤海湾盆地沧东凹陷孔二段优质烃源岩成烃环境[J].东北石油大学学报,2015,39(4):71-78.
[2]刘子藏,刘国全,葛维,等.孔南地区沙河街期凹陷基本成藏条件与勘探方向[J].天然气地球科学,2010,21(4):606-611.
[3]杨桥,漆家福,常德双,等.渤海湾盆地黄骅坳陷南部古近系(孔3):店30组6-沉31积3.时期构造古地.理演化[J].古地理学报,2009,11
[4]梁园,刘子藏,王湘君,等.沧东—南皮凹陷孔一上亚段原型盆地边界恢复[J].地质学刊,2013,37(1):17-23.
[5]赵贤正,金凤鸣,李玉帮,等.断陷盆地斜坡带类型与油气运聚成藏机制[J].石油勘探与开发,2016,43(6):841-849.
[6]彭海艳,刘家铎,李勇,等.陆相层序地层格架与油气勘探研究:以黄骅坳陷孔南地区孔店组为例[J].石油物探,2010,49(3):287-294.
[7]颜照坤,李勇,李奋生,等.沧东断层孔店期伸展、走滑作用的沉积响应[J].断块油气田,2012,19(2):158-162.
[8] RITTER U. Fractionation of petroleum during expulsion from kerogen[J]. Journal of geochemical exploration,2003,78(8):417-420.
[9]周立宏,蒲秀刚,韩文中,等.沧东凹陷南皮斜坡孔二段沉积特征与油气勘探[J].成都理工大学学报(自然科学版),2015,42(5):539-545.
[10]周立宏,蒲秀刚,张伟,等.陆相断陷油气勘探有利目标区三元定量评价方法及应用:以沧东凹陷古近系孔二段为例[J].成都理工大学学报(自然科学版),2013,40(2):184-192.
[11]徐祖新,张义杰,王居峰,等.沧东凹陷斜坡带孔二段油气富集规律[J].西安石油大学学报(自然科学版),2016,31(1):10-16.
[12]张鹏辉,梁杰,陈建文,等.海相页岩气储层特征研究进展与发展动态[J].海相油气地质,2017,22(4):69-76.
[13]蒲秀刚,韩文中,周立宏,等.黄骅坳陷沧东凹陷孔二段高位体系域细粒相区岩性特征及地质意义[J].中国石油勘探,2015,20(5):30-40.
[14]蒲秀刚,周立宏,韩文中,等.细粒相沉积地质特征与致密油勘探:以渤海湾盆地沧东凹陷孔店组二段为例[J].石油勘探与开发,2016,43(1):24-33.
[15]徐祖新,姜文亚,陈斐然,等.沧东凹陷孔二段油气分布序列与主控因素研究[J].特种油气藏,2015,22(6):14-18.
[16]李宏军,李会慎,曾建宏,等.南皮斜坡孔二段油气分布规律及主控因素分析[J].特种油气藏,2015,22(1):56-60.
[17]邹才能,杨智,张国生,等.常规-非常规油气“有序聚集”理论认识及实践意义[J].石油勘探与开发,2014,41(1):14-27.
[18]鄢继华,蒲秀刚,周立宏,等.基于X射线衍射数据的细粒沉积岩岩石定名方法与应用[J].中国石油勘探,2015,20(1):48-54.
[19]贾承造,郑民,张永峰.非常规油气地质学重要理论问题[J].石油学报,2014,35(1):1-10.
[20] RITTER U, GR?VER A. Adsorption of petroleum compounds in vitrinite:implications for petroleum expulsion from coal[J].International journal of coal geology, 2005, 62(3):183-191.
[21] RITTER U. Solubility of petroleum compounds in kerogen:implications for petroleum expulsion[J]. Organic geochemistry,2003, 34(3):319-326.
[22]徐祖新,姜文亚,张义杰,等.渤海湾盆地沧东凹陷孔二段优质烃源岩成烃环境[J].东北石油大学学报,2015,39(4):71-78.