塔里木盆地塔东地区却尔却克组烃源岩的发现及其意义
|
摘要
过去的研究认为,塔里木盆地塔东地区中—上奥陶统却尔却克组不发育烃源岩,但近期通过钻井系统取样分析,在该组泥岩中发现了烃源岩,有机质含量高达8.59%,厚度达200 m,值得高度关注。为此,通过近年探井的系统取样分析,结合地震追踪与沉积相研究,探讨了该组烃源岩发育特征及其勘探潜力。沉积相分析表明,浊流发育的探井缺乏烃源岩,而盆地相泥岩发育区有烃源岩分布;井震标定发现,浊积岩发育井区通常表现为杂乱反射,而烃源岩发育区多呈中强振幅连续—较连续地震相;根据区域地震追踪结果,认为却尔却克组烃源岩有利分布面积达5×104km2;油气源对比分析结果显示,塔东地区存在来自却尔却克组烃源岩的油气。结论认为:西北部的草湖、东北部的英东、西南部的古城等地区烃源岩较发育,热演化程度成熟度适中,是现今油气运聚的有利指向区。草湖地区、古城地区的寒武—奥陶系台缘带可勘探面积达8 000 km2,发育大型礁滩型圈闭,其侧向与烃源岩直接接触,有利于形成大型碳酸盐岩岩性油气藏。东北部的英东地区志留系、侏罗系碎屑岩发育多套储盖组合,断背斜圈闭发育,油源断裂发育,是寻找中小型次生油气藏的有利方向。
It has been basically accepted that source rocks are poorly developed in the Middle-Upper Ordovician Queerqueke Formation in the eastern Tarim Basin,so-called the Tadong area.However,recent systematic sampling and analysis of cores reveal the existence of source rocks with an organic content up to 8.59% and a thickness around 200 m.On basis of this,their characteristics of development and exploration potentials were discussed in combination with seismic tracing and sedimentary facies study.Sedimentary facies analysis shows that source rocks are absent in the wellblocks with well developed turbidite,while they occur in the wellblocks with mudstone of basin facies.Seismic calibration with well data shows that chaotic reflections occur in the wellblocks with turbidite,while continuous to relatively continuous seismic facies with moderate-to-high amplitude occur in areas with source rocks.Based on regional seismic tracing,it is believed that the distribution area of source rocks in the Queerqueke Formation is up to 50000 km2.Hydrocarbon-source correlation reveals that some of the oil/gas in the Tadong area is derived from the source rocks in the Queerqueke Formation.Caohu in the northwest,Yingdong in the northeast,and Gucheng in the Southwest have well-developed source rocks with moderate thermal maturity are favorable areas for hydrocarbon accumulation.In the Caohu and Gucheng areas,the Cambrian-Ordovician play with an area of 8000 km2 has large traps of reef-shoal type and are laterally in direct contact with the source rocks,thus having great possibilities of discovering large lithologic carbonate reservoirs.It is thought to be possible to discover moderate-small secondary hydrocarbon reservoirs in the Yingdong area,where several reservoir-seal combinations occur in the Jurassic and Silurian clastic rocks and faulted anticline traps and source faults are both well developed.
It has been basically accepted that source rocks are poorly developed in the Middle-Upper Ordovician Queerqueke Formation in the eastern Tarim Basin,so-called the Tadong area.However,recent systematic sampling and analysis of cores reveal the existence of source rocks with an organic content up to 8.59% and a thickness around 200 m.On basis of this,their characteristics of development and exploration potentials were discussed in combination with seismic tracing and sedimentary facies study.Sedimentary facies analysis shows that source rocks are absent in the wellblocks with well developed turbidite,while they occur in the wellblocks with mudstone of basin facies.Seismic calibration with well data shows that chaotic reflections occur in the wellblocks with turbidite,while continuous to relatively continuous seismic facies with moderate-to-high amplitude occur in areas with source rocks.Based on regional seismic tracing,it is believed that the distribution area of source rocks in the Queerqueke Formation is up to 50000 km2.Hydrocarbon-source correlation reveals that some of the oil/gas in the Tadong area is derived from the source rocks in the Queerqueke Formation.Caohu in the northwest,Yingdong in the northeast,and Gucheng in the Southwest have well-developed source rocks with moderate thermal maturity are favorable areas for hydrocarbon accumulation.In the Caohu and Gucheng areas,the Cambrian-Ordovician play with an area of 8000 km2 has large traps of reef-shoal type and are laterally in direct contact with the source rocks,thus having great possibilities of discovering large lithologic carbonate reservoirs.It is thought to be possible to discover moderate-small secondary hydrocarbon reservoirs in the Yingdong area,where several reservoir-seal combinations occur in the Jurassic and Silurian clastic rocks and faulted anticline traps and source faults are both well developed.
引文
[1]梁狄刚,张水昌,张宝民,等.从塔里木盆地看中国海相生油问题[J].地学前缘,2000,7(4):534-547.
[2]张水昌,王飞宇,张保民,等.塔里木盆地中上奥陶统油源层地球化学研究[J].石油学报,2000,21(6):23-28.
[3]赵靖舟.塔里木盆地北部寒武—奥陶系海相烃源岩重新认识[J].沉积学报,2001,19(1):117-124.
[4]何君,王天祥,朱卫红,等.安全、平稳、高效开发塔里木盆地天然气[J].天然气工业,2008,28(10):5-10.
[5]司学强,张金亮,谢俊.成岩圈闭对气藏的影响———以英吉苏凹陷英南2气藏为例[J].天然气工业,2008,28(6):27-30.
[6]吕宝凤,王核,夏斌.新疆塔东地区含油气系统建设与改造[J].天然气工业,2006,26(2):26-28.
[7]杨永才,常象春,张枝焕.英吉苏凹陷石油地球化学特征及油源对比[J].新疆石油地质,2006,27(4):410-413.
[8]刘忠宝,于炳松,陈晓林,等.塔里木盆地塔东地区中—上奥陶统海底扇浊积岩层序地层格架及沉积特征[J].现代地质,2003,17(4):408-414.
[9]赵宗举,潘懋,杨海军,等.塔里木盆地中—上奥陶统浊积岩物源分析及大地构造意义[J].地质科学,2010,45(3):681-697.
[10]王恕一,黄继文,蒋小琼.塔里木盆地上奥陶统沉积及古地理特征[J].石油实验地质,2006,28(3):236-248.
[11]钟广法,刘学锋,邓常念,等.塔里木盆地塔东凸起西部中上奥陶统地震层序与海底扇沉积[J].地球科学,2006,31(3):366-371.
[12]朱长见,肖中尧,张宝民,等.塔里木盆地古城4井区上寒武统—奥陶系储集层特征[J].石油勘探与开发,2008,35(2):175-181.
[13]唐友军.塔里木盆地塔东2井寒武系稠油地球化学特征与成藏[J].沉积学报,2009,27(6):1208-1215.
[14]李艳霞.塔里木盆地塔东英南2气藏气源分析[J].西安石油大学学报,2007,22(4):27-30.
[15]肖中尧,卢玉红,吴懿,等.塔里木东部满东1井志留系天然气成因与成藏期初步分析[J].地质科学,2005,40(2):262-273.
[16]卫平生,张虎权,王宏斌,等.塔中地区缝洞型碳酸盐岩储层的地球物理预测方法[J].天然气工业,2009,29(3):38-40.
[17]康玉柱.中国古大陆形成及古生代演化特征[J].天然气工业,2010,30(3):1-7.
[18]赵宗举,周新源,郑兴平,等.塔里木盆地主力烃源岩的诸多证据[J].石油学报,2005,26(3):10-15.
[19]邬光辉,陈利新,徐志明,等.塔中奥陶系碳酸盐岩油气成藏机理[J].天然气工业,2008,28(6):20-22.
[20]丁云宏,程兴生,王永辉,等.深井超深井碳酸盐岩储层深度改造技术——以塔里木油田为例[J].天然气工业,2009,29(9):81-84.
[21]张水昌,WANG R L,金之钧,等.塔里木盆地寒武纪—奥陶纪优质烃源岩沉积与古环境变化的关系:碳氧同位素新证据[J].地质学报,2006,80(3):459-466.
[2]张水昌,王飞宇,张保民,等.塔里木盆地中上奥陶统油源层地球化学研究[J].石油学报,2000,21(6):23-28.
[3]赵靖舟.塔里木盆地北部寒武—奥陶系海相烃源岩重新认识[J].沉积学报,2001,19(1):117-124.
[4]何君,王天祥,朱卫红,等.安全、平稳、高效开发塔里木盆地天然气[J].天然气工业,2008,28(10):5-10.
[5]司学强,张金亮,谢俊.成岩圈闭对气藏的影响———以英吉苏凹陷英南2气藏为例[J].天然气工业,2008,28(6):27-30.
[6]吕宝凤,王核,夏斌.新疆塔东地区含油气系统建设与改造[J].天然气工业,2006,26(2):26-28.
[7]杨永才,常象春,张枝焕.英吉苏凹陷石油地球化学特征及油源对比[J].新疆石油地质,2006,27(4):410-413.
[8]刘忠宝,于炳松,陈晓林,等.塔里木盆地塔东地区中—上奥陶统海底扇浊积岩层序地层格架及沉积特征[J].现代地质,2003,17(4):408-414.
[9]赵宗举,潘懋,杨海军,等.塔里木盆地中—上奥陶统浊积岩物源分析及大地构造意义[J].地质科学,2010,45(3):681-697.
[10]王恕一,黄继文,蒋小琼.塔里木盆地上奥陶统沉积及古地理特征[J].石油实验地质,2006,28(3):236-248.
[11]钟广法,刘学锋,邓常念,等.塔里木盆地塔东凸起西部中上奥陶统地震层序与海底扇沉积[J].地球科学,2006,31(3):366-371.
[12]朱长见,肖中尧,张宝民,等.塔里木盆地古城4井区上寒武统—奥陶系储集层特征[J].石油勘探与开发,2008,35(2):175-181.
[13]唐友军.塔里木盆地塔东2井寒武系稠油地球化学特征与成藏[J].沉积学报,2009,27(6):1208-1215.
[14]李艳霞.塔里木盆地塔东英南2气藏气源分析[J].西安石油大学学报,2007,22(4):27-30.
[15]肖中尧,卢玉红,吴懿,等.塔里木东部满东1井志留系天然气成因与成藏期初步分析[J].地质科学,2005,40(2):262-273.
[16]卫平生,张虎权,王宏斌,等.塔中地区缝洞型碳酸盐岩储层的地球物理预测方法[J].天然气工业,2009,29(3):38-40.
[17]康玉柱.中国古大陆形成及古生代演化特征[J].天然气工业,2010,30(3):1-7.
[18]赵宗举,周新源,郑兴平,等.塔里木盆地主力烃源岩的诸多证据[J].石油学报,2005,26(3):10-15.
[19]邬光辉,陈利新,徐志明,等.塔中奥陶系碳酸盐岩油气成藏机理[J].天然气工业,2008,28(6):20-22.
[20]丁云宏,程兴生,王永辉,等.深井超深井碳酸盐岩储层深度改造技术——以塔里木油田为例[J].天然气工业,2009,29(9):81-84.
[21]张水昌,WANG R L,金之钧,等.塔里木盆地寒武纪—奥陶纪优质烃源岩沉积与古环境变化的关系:碳氧同位素新证据[J].地质学报,2006,80(3):459-466.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心