坳陷湖盆缓坡重力流成因储集层沉积特征及发育条件——以准噶尔盆地腹部石南31井区为例
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摘要
石南31油田是准噶尔盆地腹部石南地区近年来发现的一个大型岩性油气藏,其地层属于白垩系清水河组一段的K1q11砂层组,发育于坳陷湖盆缓坡构造背景下,储集层沉积类型认识存在争议。通过岩心观察并结合地震资料分析,认为石南31井区地层具备发育重力流沉积的必要条件,论证了坳陷湖盆在具备沟谷、阶地的特定古地貌特征以及充沛的物源等条件下是可以发育重力流沉积的。
Shinan-31 Wellblock is a large lithologic oil-gas reservoir discovered in Shinan area in hinterland of Junggar basin in recent years.Its petroliferous strata around the ramp margins of depression-lacustrine basin belong to the K1q11 sand layer of Qingshuihe formation of Cretaceous.But there has been controversial on the sedimentary facies type of the reservoir.The core observation and seismic information analysis suggest that in Shinan-31 Wellblock possesses the necessary conditions for forming gravity flow sediments.It is concluded that in the conditions of valley,terrace and plentiful mass supplementation,gravity flow sediments can develop in the depression-lacustrine basin.
Shinan-31 Wellblock is a large lithologic oil-gas reservoir discovered in Shinan area in hinterland of Junggar basin in recent years.Its petroliferous strata around the ramp margins of depression-lacustrine basin belong to the K1q11 sand layer of Qingshuihe formation of Cretaceous.But there has been controversial on the sedimentary facies type of the reservoir.The core observation and seismic information analysis suggest that in Shinan-31 Wellblock possesses the necessary conditions for forming gravity flow sediments.It is concluded that in the conditions of valley,terrace and plentiful mass supplementation,gravity flow sediments can develop in the depression-lacustrine basin.
引文
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[2]郭成贤.我国深水异地沉积研究三十年[J].古地理学报,2000,2(1):1-10.
[3]夏文臣,张学义,徐安顺,等.聚煤盆地中的水下重力流沉积[J].地球科学-中国地质大学学报,1989,14(6):585-592.
[4]唐勇,周文泉,赵克斌,等.准噶尔盆地石南31井区含油气层位归属与划分[J].新疆石油地质,2007,28(1):119-121.
[2]郭成贤.我国深水异地沉积研究三十年[J].古地理学报,2000,2(1):1-10.
[3]夏文臣,张学义,徐安顺,等.聚煤盆地中的水下重力流沉积[J].地球科学-中国地质大学学报,1989,14(6):585-592.
[4]唐勇,周文泉,赵克斌,等.准噶尔盆地石南31井区含油气层位归属与划分[J].新疆石油地质,2007,28(1):119-121.
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