库车坳陷多种能源矿产富集规律研究
发布时间：2018-09-06 15:54
【摘要】：库车坳陷位于塔里木盆地北缘,北接天山造山带,地质历史上经历了多期构造运动,形成了现今三凹四隆的构造格局,具有南北分带,东西分段的特点。库车坳陷克拉2气田资源量超千亿立方米,石油、天然气、煤等常规能源矿产十分富集,非常规能源矿产如页岩气、致密砂岩气、煤层气以及油砂等,在坳陷中也具有非常可观的资源量。各种单一能源矿产的富集成藏研究表明,它们不仅在时空分布复杂有序,在成藏的过程中也相互影响。平面上,坳陷形成南油北气,东部湿气西部干气的特点。石油主要分布在南部斜坡带上;天然气分布在北部克依构造带和秋里塔格构造带东部,南部斜坡带存在凝析气;煤和煤层气主要分布在库拜煤田和阳霞地区;油砂分布在天山山前带;致密砂岩气分布在拜城凹陷和阳霞凹陷稳定构造带上;页岩气分布在北部克依构造带浅层。烃源岩层位是三叠系和侏罗系,沉积厚度大,以Ⅱ2和Ⅲ型为主,有机质丰度高,成熟度高,现今以生气为主;纵向上,白垩系、古近系为主要储层,侏罗系、新近系为次要储层;古近系和新近系两套膏盐层是优越的区域性盖层,形成多套储盖体系,是该区大中型气田得以保存的前提;断层的发育沟通了烃源岩和储层。侏罗系和三叠系地层的烃源岩热演化是该区能源矿产的形成、分布、组合共生的基础。本文通过收集前人的地层岩性及比例、孔隙度、渗透率、热导率、大地热流、地温梯度等数据,在库车坳陷西、中、东部三条地震剖面上各布置1口人工单井,利用盆地模拟的技术方法,进行埋藏史、生烃史等的模拟研究可知,中段、西段、东段分别在130、125、110Ma热程度度达到0.5%,现今热成熟度中西部较高,Ro大于2.0%,进入干气生成阶段,东部较低,Ro在1.0~2.0%以湿气生成为主。以生烃演化为基础,结合相关地质条件,进行多种能源在时空富集的关联性研究,并对库车划分为北部多种能源矿产发育带、中部多种能源矿产发育带以及南部多种能源矿产发育带,以期为将来该区的能源勘探提供理论知识上的借鉴。
[Abstract]:Kuqa depression is located in the northern margin of Tarim Basin and is connected with Tianshan orogenic belt to the north. It has undergone many tectonic movements in geological history and formed the present structural pattern of three concave and four uplift with the characteristics of dividing the north and the south and dividing the east and the west. Kela 2 gas field in Kuqa depression has a resource of more than 100 billion cubic meters. Conventional energy minerals such as oil, natural gas and coal are very rich. Unconventional energy minerals such as shale gas, tight sandstone gas, coalbed methane and oil sand, etc. There are also considerable resources in the depression. The studies of rich and integrated reservoirs of various single energy minerals show that they not only have complex and orderly distribution in time and space, but also interact with each other in the process of reservoir formation. On the plane, the depression forms the north gas of south oil and the dry gas of the west of east wet gas. Oil mainly distributes in the southern slope belt, natural gas distributes in the east of Keyi structural belt and Qiulitag structural belt in the north, condensate gas exists in the southern slope zone, coal and coalbed methane mainly distributes in Kuba coalfield and Yangxia area. The oil sand is distributed in the Tianshan mountain front belt, the tight sandstone gas is distributed in the stable structural belt of Baicheng depression and Yangxia depression, and the shale gas is distributed in the shallow layer of the Keyi structural belt in the north. The source rocks are Triassic and Jurassic, with large sedimentary thickness, mainly type 鈪，
本文编号：2226832
[Abstract]:Kuqa depression is located in the northern margin of Tarim Basin and is connected with Tianshan orogenic belt to the north. It has undergone many tectonic movements in geological history and formed the present structural pattern of three concave and four uplift with the characteristics of dividing the north and the south and dividing the east and the west. Kela 2 gas field in Kuqa depression has a resource of more than 100 billion cubic meters. Conventional energy minerals such as oil, natural gas and coal are very rich. Unconventional energy minerals such as shale gas, tight sandstone gas, coalbed methane and oil sand, etc. There are also considerable resources in the depression. The studies of rich and integrated reservoirs of various single energy minerals show that they not only have complex and orderly distribution in time and space, but also interact with each other in the process of reservoir formation. On the plane, the depression forms the north gas of south oil and the dry gas of the west of east wet gas. Oil mainly distributes in the southern slope belt, natural gas distributes in the east of Keyi structural belt and Qiulitag structural belt in the north, condensate gas exists in the southern slope zone, coal and coalbed methane mainly distributes in Kuba coalfield and Yangxia area. The oil sand is distributed in the Tianshan mountain front belt, the tight sandstone gas is distributed in the stable structural belt of Baicheng depression and Yangxia depression, and the shale gas is distributed in the shallow layer of the Keyi structural belt in the north. The source rocks are Triassic and Jurassic, with large sedimentary thickness, mainly type 鈪，
本文编号：2226832
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