新疆地质
新疆地質
신강지질
XINJIANG GEOLOGY
2014年
4期
451-456
,共6页
塔里木西南%二叠系%沉积相%沉积环境演化
塔裏木西南%二疊繫%沉積相%沉積環境縯化
탑리목서남%이첩계%침적상%침적배경연화
Southwest Tarim%Permian%Sedimentary facies%Sedimentary environment evolution
塔里木西南地区二叠系分布广泛，认识其沉积和演化特征对分析二叠系油气资源潜力意义重大。结合前人研究成果，通过山前露头剖面观测、盆地钻测井解释、岩心观察、样品分析测试等，认为二叠系主要发育开阔台地、局限台地、潮坪、浅海混积陆棚、三角洲、冲积扇、滨浅湖相等多种沉积相类型。分析塔里木西南地区二叠系下、中、上统发育的主要沉积相类型，认为从早二叠世至晚二叠世，其为一个从海洋到陆地的演化过程，演化受控于海平面变化、构造活动、沉积物源供给和气候变化。不同时期，主控因素不同。下二叠统的形成受控于海平面处于相对高水位；中二叠统的形成受控于海平面下降和火山活动，海平面下降导致气候逐渐炎热干燥；上二叠统的形成受控于构造活动，构造活动导致地形变化和沉积物源的供给。
塔裏木西南地區二疊繫分佈廣汎，認識其沉積和縯化特徵對分析二疊繫油氣資源潛力意義重大。結閤前人研究成果，通過山前露頭剖麵觀測、盆地鑽測井解釋、巖心觀察、樣品分析測試等，認為二疊繫主要髮育開闊檯地、跼限檯地、潮坪、淺海混積陸棚、三角洲、遲積扇、濱淺湖相等多種沉積相類型。分析塔裏木西南地區二疊繫下、中、上統髮育的主要沉積相類型，認為從早二疊世至晚二疊世，其為一箇從海洋到陸地的縯化過程，縯化受控于海平麵變化、構造活動、沉積物源供給和氣候變化。不同時期，主控因素不同。下二疊統的形成受控于海平麵處于相對高水位；中二疊統的形成受控于海平麵下降和火山活動，海平麵下降導緻氣候逐漸炎熱榦燥；上二疊統的形成受控于構造活動，構造活動導緻地形變化和沉積物源的供給。
탑리목서남지구이첩계분포엄범，인식기침적화연화특정대분석이첩계유기자원잠력의의중대。결합전인연구성과，통과산전로두부면관측、분지찬측정해석、암심관찰、양품분석측시등，인위이첩계주요발육개활태지、국한태지、조평、천해혼적륙붕、삼각주、충적선、빈천호상등다충침적상류형。분석탑리목서남지구이첩계하、중、상통발육적주요침적상류형，인위종조이첩세지만이첩세，기위일개종해양도륙지적연화과정，연화수공우해평면변화、구조활동、침적물원공급화기후변화。불동시기，주공인소불동。하이첩통적형성수공우해평면처우상대고수위；중이첩통적형성수공우해평면하강화화산활동，해평면하강도치기후축점염열간조；상이첩통적형성수공우구조활동，구조활동도치지형변화화침적물원적공급。
Permian in Southwest Tarim widely distributed,analyze its sedimentary characteristics and evolution as a whole regionally is significant for prediction of oil-gas resource potential.Through of foreland outcrop observation, drill-ing and well logging interpretation, core observation and sample analysis, combined with previous known results, 7 main developmental facies (open platform facies, restrcted platform facies, tidal-flat facies, shallow clasolite-carbonatite conti-nental shelf , delta facies, alluvial fan facies, shore-shallow lake facies) are recognized in Permian. The main develop-ment types of sedimentary facies of the lower, middle and upper Permian in southwestern Tarim are analyzed, from the early Permian to late Permian, it is a process of evolution from marine sediments to the continental sediments, which is controlled by the sea level change, tectonics, sediment supply and climate change, in different periods, the main control-ling factor is different. The formation and development of the Lower Permian is mainly controlled by sea level in a rela-tively high water level;The formation of Middle Permian is controlled by falling sea level and volcanic activity, sea level fall causing the climate gradually become dry and hot;the Upper Permian formation is mainly controlled by tectonic ac-tivity, which resulted the morphological changes and sediment source supply.
