吐鲁番坳陷中下侏罗统高精度层序地层格架的建立
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摘要
运用高精度层序地层学理论,通过对露头剖面、钻/测井和地震等资料的综合研究,进行了露头剖面层序划分、钻/测井层序界面识别、井间层序划分与对比及地震层序划分。结果显示,在吐鲁番坳陷中下侏罗统识别出6个三级层序,包含着10个四级层序。四级层序更接近自然沉积旋回,即下部以河流相或辫状三角洲相分流河道砂岩为主,夹薄层泥质岩,上部则以滨浅湖相泥质岩为主,夹薄层砂岩。并建立了以寻找岩性地层油气藏为目标的吐鲁番坳陷中下侏罗统高精度层序地层格架。
The middle-lower Jurassic in Turpan Sag is divided into six third class sequences and ten fourth class sequences by using the theories and methods of high-precision sequence stratigraphy and comprehensive studies of the outcrop section,drilling/logging and seismic data,being a research process including the division of sequence stratigraphy of the outcrop section,the identification of sequence surface of drilling/logging,the division and correlation of sequence stratigraphy among the wells,and the division of sequence stratigraphy of seismism.The fourth class sequence of the sag approaches the natural sedimentary cyclothem,the low of which is mainly consisted of the distributary channel sandstones including the lamina argillites in the fluvial facies or the braided river delta facies,and the top of which is mainly consisted of the argillites including the lamina sandstones in the shore and mere facies.On the basis of the study a high-precision sequence framework of middle-lower Jurassic in Turpan Sag is established,which is very important for looking for lithologic hydrocarbon reservoirs.
The middle-lower Jurassic in Turpan Sag is divided into six third class sequences and ten fourth class sequences by using the theories and methods of high-precision sequence stratigraphy and comprehensive studies of the outcrop section,drilling/logging and seismic data,being a research process including the division of sequence stratigraphy of the outcrop section,the identification of sequence surface of drilling/logging,the division and correlation of sequence stratigraphy among the wells,and the division of sequence stratigraphy of seismism.The fourth class sequence of the sag approaches the natural sedimentary cyclothem,the low of which is mainly consisted of the distributary channel sandstones including the lamina argillites in the fluvial facies or the braided river delta facies,and the top of which is mainly consisted of the argillites including the lamina sandstones in the shore and mere facies.On the basis of the study a high-precision sequence framework of middle-lower Jurassic in Turpan Sag is established,which is very important for looking for lithologic hydrocarbon reservoirs.
引文
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