塔中40油田东河砂岩不整合复合体及油气分布规律
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摘要
综合运用地震、测井和钻井资料,将塔中40油田东河砂岩划分为均质段、上交互段和含砾砂岩段,识别出含砾砂岩段底部不整合面,确立了东河砂岩不整合复合体层序及岩性结构分类方案,并进一步定量分析不整合复合体不同层序结构地层的孔隙度、渗透率和含油饱和度。研究结果认为,研究区东河砂岩不整合复合体层序地层结构为Ⅰ1和Ⅰ2型,部分区域发育Ⅰ4型。岩性结构属于Ⅰ2和Ⅱ2亚类。不整合复合体下伏海侵体系域(TST)以砂岩沉积为主,孔渗好,含油性相对较差;高位体系域以砂岩沉积为主,孔渗和含油性均较好,顶部有一套泥岩和粉砂岩隔层,发育有断层-不整合遮挡型油气藏和断层-背斜型油气藏。不整合复合体上覆地层低位体系域(LST)中,砂泥交互沉积,砂岩孔渗和含油性相对较好,以断层-岩性型油气藏为主。海侵体系域中,泥包砂,孔渗较差,含油性一般,以断层-岩性型油气藏为主。
By using the seismic,well logging and drilling information,the Donghe sandstone unconformity complex in Tazhong-40 oilfield of Tarim basin is divided into homogeneous section,upper cross-bedding section and conglomeratic sandstone section,identifying the bottom unconformity of the conglomeratic sandstone section,establishing the unconformity complex sequence and lithologic structure classification,by which the porosity,permeability and oil saturation of strata with different sequential structures in the complex are quantitatively analyzed.The results show that the structures of the sequence stratigraphy of Donghe sandstone unconformity complex include Type-I1 and I2 with local Type-I4,the lithological structure belongs to Sub-Type-I2 and II2.The underlying transgressive systems tract(TST) of the unconformity complex is dominated by sand sediment,with high porosity and permeability as well as relatively poor oil saturation;the highstand systems tract(HST) is dominated by sandstone sediment,with relatively high porosity,permeability and oil saturation,developing a set of mudstone and siltstone barrier on the top of it,and fault-unconformity sheltered and fault-anticline reservoirs.The overlying lowstand systems tract(LST) of the unconformity complex is characterized by sand-mud interbedded sediments,with relatively high porosity,permeability and oil saturation,mainly developing fault-lithologic reservoir.Its TST is characterized by arenaceous mudstone,poor porosity and permeability,and medium oil saturation,mainly developing fault-lithologic reservoir.
By using the seismic,well logging and drilling information,the Donghe sandstone unconformity complex in Tazhong-40 oilfield of Tarim basin is divided into homogeneous section,upper cross-bedding section and conglomeratic sandstone section,identifying the bottom unconformity of the conglomeratic sandstone section,establishing the unconformity complex sequence and lithologic structure classification,by which the porosity,permeability and oil saturation of strata with different sequential structures in the complex are quantitatively analyzed.The results show that the structures of the sequence stratigraphy of Donghe sandstone unconformity complex include Type-I1 and I2 with local Type-I4,the lithological structure belongs to Sub-Type-I2 and II2.The underlying transgressive systems tract(TST) of the unconformity complex is dominated by sand sediment,with high porosity and permeability as well as relatively poor oil saturation;the highstand systems tract(HST) is dominated by sandstone sediment,with relatively high porosity,permeability and oil saturation,developing a set of mudstone and siltstone barrier on the top of it,and fault-unconformity sheltered and fault-anticline reservoirs.The overlying lowstand systems tract(LST) of the unconformity complex is characterized by sand-mud interbedded sediments,with relatively high porosity,permeability and oil saturation,mainly developing fault-lithologic reservoir.Its TST is characterized by arenaceous mudstone,poor porosity and permeability,and medium oil saturation,mainly developing fault-lithologic reservoir.
引文
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[4]吴孔友,李林林,查明.不整合纵向结构及其成藏作用物理模拟[J].石油实验地质,2009,31(5):537-541.
[5]金振奎,时晓章,何苗.单河道砂体的识别方法[J].新疆石油地质,2010,31(6):572-575.
[6]周新平,徐怀民,王仁冲,等.准噶尔盆地侏罗系不整合复合体及其岩性地层油气藏[J].现代地质,2012,26(3):581-588.
[7]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.
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