川西地区须二段高分辨率层序地层研究
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摘要
川西上三叠统须二段以砂岩层巨厚、致密、非均质性和广布为典型特征,是该区的主要产气层,如何细化这类非均质性较强的储集层,从而提高勘探成功率是必须解决的难题。为此,以高分辨率层序地层学原理为指导,以沉积微相、测井相及组合模式为基础,将须二段内部划分出6个中期旋回,并通过井—震对比和地震层序约束,完成了该区须二段中期旋回的精细对比,并建立了高分辨率层序地层格架。在格架内以旋回为单元展开了砂体特征和储层展布研究,取得了较好效果。
T3x2 is typically characterized by a very thick and tight sandstone layer that is inhomogeneous and widely distributed, and is the key gas-producing zone in West Sichuan Basin. How to finely delineate this type of reservoir with strong heterogeneity needed to be solved to improve exploration successful rate. On the basis of the theory of high resolution sequence stratigraphy, and sedimentary micro-facies, logging facies and their combination patterns, the paper divided the interior of T3x2 into six metaphase cyclic sequences, and completed fine comparisons of six metaphase cyclic sequences by comparing logging data and seismic data under the constraint of the seismic sequence, and built the strata framework of the high resolution sequence stratigraphy. Taking the sedimentary cycle as the unit, the paper studied well on the sandstone body properties and the reservoir distributions in the strata framework, with absolutely good results.
T3x2 is typically characterized by a very thick and tight sandstone layer that is inhomogeneous and widely distributed, and is the key gas-producing zone in West Sichuan Basin. How to finely delineate this type of reservoir with strong heterogeneity needed to be solved to improve exploration successful rate. On the basis of the theory of high resolution sequence stratigraphy, and sedimentary micro-facies, logging facies and their combination patterns, the paper divided the interior of T3x2 into six metaphase cyclic sequences, and completed fine comparisons of six metaphase cyclic sequences by comparing logging data and seismic data under the constraint of the seismic sequence, and built the strata framework of the high resolution sequence stratigraphy. Taking the sedimentary cycle as the unit, the paper studied well on the sandstone body properties and the reservoir distributions in the strata framework, with absolutely good results.
引文
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[2]罗志立,赵锡奎,刘树根,等.龙门山造山带的崛起和四川盆地的形成与演化[M].四川:成都科技大学出版社,1994.
[3]刘树根.龙门山冲断带与川西前陆盆地的形成演化[M].四川:成都科技大学出版社,1993.
[4]苟宗海.四川龙门山中断上三叠统须家河组特征[J].沉积与特提斯地质,2001,21(1):93-101.
[5]邹光富,夏彤,楼海英.四川广元地区上三叠统小塘子组、须家河组层序地层研究[J].沉积与特提斯地质,2003,23(3):73-79.
[6]叶泰然,郑荣才.川西坳陷须二段层序地层特征及储层预测[J].天然气工业,2004,24(11):45-48.
[7]辛艳朋,牟中海,郭维华,等.退积型扇三角洲高分辨率层序地层学研究[J].西南石油大学学报,2007,29(2):68-71.
[8]古俊林,郑荣才,罗平,等.川西坳陷中—南段须家河组层序地层格架与生储盖组合[J].成都理工大学学报:自然科学版,2004,31(3):282-289.
[9]李绍虎,吴冲龙,王华,等.四川须家河组层序地层格架与天然气成藏的关系[J].石油与天然气地质,1998,19(2):146-150.
[10]吴朝容,段文燊,李正文.致密碎屑岩裂缝视密度高分辨率非线性反演[J].西南石油大学学报,2007,29(2):89-91.
[11]周文.川西汉王场香二成岩圈闭气藏研究[J].天然气工业,1991,11(2).
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