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塔里木盆地东部沉积及成藏特征研究
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摘要
研究区位于塔里木盆地东部,隶属于塔里木板块,包括孔雀河斜坡、英吉苏凹陷、罗布泊凹陷、塔东低凸起以及塔南隆起和塔东南拗陷的北部,约占整个盆地面积的四分之一。
     在1960年以前,塔东地区石油地质工作仅限于地面地质调查,所调查的区域包括库鲁克塔格和阿尔金两个地区。区内首次石油勘探工作完成于上世纪六十年代,共完钻6口探井,未获油气显示。自塔里木石油勘探指挥部成立至今,在塔东地区展开了新一轮的油气勘探,相继在多口探井获得油气发现,打开了塔东地区油气勘探的新局面。
     塔东地区的沉积盖层系统包括震旦系、古生界、中生界和新生界,沉积厚度近万米。多期构造活动的改造,总体表现为早古生代拉张裂陷、晚古生代抬升剥蚀、中新生代稳定沉降。在沉积演化上表现为六个阶段:震旦纪—奥陶纪演化阶段、志留纪—泥盆纪演化阶段、石炭纪—早二叠世演化阶段、晚三叠世—中侏罗世演化阶段、白垩纪演化阶段和新生代演化阶段。沉积环境的变迁直接影响到沉积相带的展布,最终决定了生、储、盖层的时空分布。
     在塔东地区已证实有两套主要的烃源岩层系:海相的寒武系-下奥陶统烃源岩和陆相的侏罗系烃源岩。寒武系-下奥陶统烃源岩具有厚度大、分布广、丰度高、热演化程度高的特点,区内油气主要来源于该套烃源岩;侏罗系烃源岩是一套煤系源岩,成熟度低,现今仅达到未成熟-低成熟阶段,局部成熟的烃源岩以产低熟的凝析油气为主。中上奥陶统可能是本区一套潜在的烃源层系。
     塔东地区储层类型包括碎屑岩和碳酸盐岩两大类。下志留统、侏罗系和下白垩统的碎屑岩储层和震旦系、寒武系的碳酸盐岩储层是主要的储层段。其中,侏罗系和下白垩统内的储层条件较好。下白垩统红色泥岩段和侏罗系克孜勒努尔组内的泥岩段是塔东地区的区域盖层,其他泥岩盖层,以及泥质岩夹煤层和致密砂岩盖层都属局部盖层。在研究区内共划分出10套储盖组合,震旦系—古生界和中生界各5套,以中生界储盖组合较好。
     总结出三种成藏模式:古生古储早期油气聚集模式、古生新储晚期油气聚集模式、新生新储与新生古储晚期油气聚集模式。优选出7个油气勘探的有利区带,包括5个古生界有利区带、2个中生界有利区带。
The study area, which belongs to Tarim plate according to structural division, is located in the east of Tarim basin,and consists of Kongquehe slope,Yingjisu depression,Luobupo depression,and the north area of Tadong lower uplift and south-eastern depression.This area is nearly 25 percent of Tarim basin.Only the geologic ground survey had been completed before 1960 , including Kuluketage area and Aerjin area. Six exploratory wells had been drilled during 1960s with finding nothing, and it is the first time to drill for oil exploration in this area. The newly oil exploration work has been performing from the founding of Tarim headquarters to now. Oil and gas accumulations have been found in several wells, which indicates that the new era of oil and gas exploration is coming.The depositional cover incloudes Sinian system, Palaeozoic group, Mesozoic group, and Cainozoic group. The depositional thickness of all is nearly 10000 metres. Much tectogenesis had occurred in the past. The representation of tectogenesis is different in every geologic epoch, pull-apart depression in early Palaeozoic, uplift-denude area in late Palaeozoic, stable subsidence depression in Mesozoic era and Cenozoic era. There are six sedimentary evolution stages, such as, Sinian-Ordovician stage, Silurian-Devonian stage, Carboniferous-early Dias stage, late Triassic-middle Jurassic stage, Cretaceous stage,and Cenozoic stage. The change of sedimentary environment directly affects the distribution of sedimentary facies which determines the special distribution of oil sources, reservoirs and covers.Two oil source sets have been discovered. One comes from marine set of Cmbrian-lower Ordovician.The other comes from continental set of Jurassic. The Cmbrian-lower Ordovician source rock provides the mainly oil resource in study area which is thick,wide-ranging,lush and high maturation. The maturity index of Jurassic source rock, which comes from coal-measure strata, is lower. The thermal evolution of Jurassic source rock is in low-immature stage now. Partial mature source rock's product is mainly condensate. Middle-upper Ordovician maybe a potential oil source rock set.Two reservoir types are detrital reservoir rock and carbonate reservoir rock.The major reservoir sets are the detrital reservoir rock in lower Silurian, Jurassic, lower Cretaceous, and carbonate reservoir rock in Sinian and Palaeozoic in study area,among them the lower Silurian and Jurassic reservoir is better.The regional covers of study area are red mudstone in lower Silurian and the mudstone in Kezilenuer group of Jurassic.The other mudstone, argillaceous rock parting coal, as well as tight sandstone are local covers.There are ten reservoir-cover assemblages in study area,five in Sinian- Palaeozoic,the rest in Mesozoic whose assemblage is better.Three accmulation models have been summarized.The early accmulation model is Paleozoic source - Paleozoic reservoir. The late accmulation model is Paleozoic source -Mesozoic reservoir. The late accmulation model is Mesozoic source - Mesozoic reservoir or Paleozoic reservoir. There are seven favourable tectonic belts selected for exploration target in study area, five in Palaeozoic, the rest in Mesozoic .
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