摘要
白垩系巴什基奇克组是库车坳陷大北—克拉苏深层构造带一套优质储层和主要产层,其埋深大于5 000m,岩心资料缺乏,有效储层分布预测难度大。应用模型预测法、测井孔隙度包络线法、有效储层占砂岩厚度百分比法和盆模正演法4种方法,对大北—克拉苏深层构造带有效储层的埋深下限进行了预测。由于方法本身和资料品质的差异性,在不同构造区带不同方法预测的相对可靠程度以及结果有差异。采用储层评价中常用的"权重"评价法,根据各种方法的可靠程度,给予不同的权重系数,对大北—克拉苏深层构造带综合评价表明,其有效储层埋深下限约为8 000～8 300m,其中大北区带约为8 200m,克深区带约为8 300m,克深北区带和克深南区带约为8 100m,拜城北区带约为8 000m。有效储层占砂岩厚度百分比是深部储层评价的重要参数,大北—克拉苏深层构造带巴什基奇克组储层埋深与有效储层占砂岩厚度百分比呈三次幂关系,可以利用储集层的埋深范围,反过来求其有效储层厚度。
The Cretaceous Bashijiqike Formation is one of the high-quality sandstone reservoirs and a primary oil/gas-producing bed in the Kuqa Depression of Tarim Basin.As its burial depth is more than 5000m and cores are limited,the prediction of effective reservoirs in the Dabei-Kelasu deep structural belt is considerably difficult.Four methods,including the model-based prediction,envelop curves of porosity from logging data,the ration of effective reservoirs to sandstones and the forward modeling for Basin Modeling Software,have been used to predict the lower limit of buried depths of researched area.Due to the diversity of methods themselves and the data qualities,differences in methodological reliability and veracity by different methods existed in different structure areas.The ＂weighting＂ hypothetical valuation method that be common used in reservoirs valuation,by giving different weight coefficients based on the reliability of various methods,has also been used.Finally the lower limit of burial depth of effective reservoirs in the Dabei-Kelasu deep structural areas was predicted to be about 8000-8300m,that Dabei area was about 8200m,Keshen area was about 8300m,the north and south of Keshen area were about 8100m,the northern of Baicheng area was about 8000m.The ratio of effective reservoirs to sandstones is an important parameter for the evaluation of deeply-buried reservoirs,the burial depth of deep reservoirs and the ratio of effective reservoirs to sandstones of the Bashijiqike Formation in the Dabei-Kelasu deep structural belt had a third power relationship,by which the burial range of reservoirs could be used to inversely predict the thickness of effective reservoirs.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2011年第2期212-218,共7页
Acta Petrolei Sinica
基金
国家自然科学基金项目(No.40472069)
中国石油天然气集团公司科技创新基金项目(2008D-5006-01-03)联合资助
关键词
有效储层
埋深下限
巴什基奇克组
白垩系
大北—克拉苏深层构造带
库车坳陷
effective reservoir
lower limit of burial depth
Bashijiqike Formation
Cretaceous
Dabei-Kelasu deep structural belt
Kuqa Depression
