石油与天然气地质
石油與天然氣地質
석유여천연기지질
OIL & GAS GEOLOGY
2014年
1期
98-106
,共9页
逆冲作用%滑脱作用%断裂系统%玉北地区%塔里木盆地
逆遲作用%滑脫作用%斷裂繫統%玉北地區%塔裏木盆地
역충작용%활탈작용%단렬계통%옥북지구%탑리목분지
thrusting%detachment%fault system%Yubei area%Tarim Basin
通过三维地震资料精细解释、钻井资料和地质资料综合对比分析，认为塔里木盆地玉北地区断裂系统主体表现为逆冲断裂。断裂主要在两个层次发育：一是发育在基底，构成基底断裂带或基底软弱带；二是发育在寒武系-奥陶系碳酸盐岩中的断裂带。玉北地区断裂系统由一系列呈北东东走向的断裂带组成，主要包括玉北7断裂带、玉北1断裂带、玉东1断裂带、玉东2断裂带、玉东3断裂带、玉东4断裂带等。单个断裂带往往由一条主断裂及其伴生的一组次级断裂组成。主断裂断面倾角上陡下缓，往深层在中-下寒武统盐岩层系中发生滑脱。主断裂和次级断裂常形成背冲型断裂组合，在剖面上构成“断垒”形态。寒武系-奥陶系碳酸盐岩断裂带主要形成于加里东中期，经历了加里东中期早幕（早奥陶世蓬莱坝期）、Ⅰ幕（早-中奥陶世鹰山期）和Ⅲ幕（晚奥陶世）3个幕次的活动，海西晚期断裂活动非常微弱。断裂带具有明显的分段变形特点，断裂系统和主不整合共同制约垂向构造分层。
通過三維地震資料精細解釋、鑽井資料和地質資料綜閤對比分析，認為塔裏木盆地玉北地區斷裂繫統主體錶現為逆遲斷裂。斷裂主要在兩箇層次髮育：一是髮育在基底，構成基底斷裂帶或基底軟弱帶；二是髮育在寒武繫-奧陶繫碳痠鹽巖中的斷裂帶。玉北地區斷裂繫統由一繫列呈北東東走嚮的斷裂帶組成，主要包括玉北7斷裂帶、玉北1斷裂帶、玉東1斷裂帶、玉東2斷裂帶、玉東3斷裂帶、玉東4斷裂帶等。單箇斷裂帶往往由一條主斷裂及其伴生的一組次級斷裂組成。主斷裂斷麵傾角上陡下緩，往深層在中-下寒武統鹽巖層繫中髮生滑脫。主斷裂和次級斷裂常形成揹遲型斷裂組閤，在剖麵上構成“斷壘”形態。寒武繫-奧陶繫碳痠鹽巖斷裂帶主要形成于加裏東中期，經歷瞭加裏東中期早幕（早奧陶世蓬萊壩期）、Ⅰ幕（早-中奧陶世鷹山期）和Ⅲ幕（晚奧陶世）3箇幕次的活動，海西晚期斷裂活動非常微弱。斷裂帶具有明顯的分段變形特點，斷裂繫統和主不整閤共同製約垂嚮構造分層。
통과삼유지진자료정세해석、찬정자료화지질자료종합대비분석，인위탑리목분지옥북지구단렬계통주체표현위역충단렬。단렬주요재량개층차발육：일시발육재기저，구성기저단렬대혹기저연약대；이시발육재한무계-오도계탄산염암중적단렬대。옥북지구단렬계통유일계렬정북동동주향적단렬대조성，주요포괄옥북7단렬대、옥북1단렬대、옥동1단렬대、옥동2단렬대、옥동3단렬대、옥동4단렬대등。단개단렬대왕왕유일조주단렬급기반생적일조차급단렬조성。주단렬단면경각상두하완，왕심층재중-하한무통염암층계중발생활탈。주단렬화차급단렬상형성배충형단렬조합，재부면상구성“단루”형태。한무계-오도계탄산염암단렬대주요형성우가리동중기，경력료가리동중기조막（조오도세봉래패기）、Ⅰ막（조-중오도세응산기）화Ⅲ막（만오도세）3개막차적활동，해서만기단렬활동비상미약。단렬대구유명현적분단변형특점，단렬계통화주불정합공동제약수향구조분층。
Based on accurate 3-D seismic interpretation ,comprehensive analysis of the drilling and geological data ,it is in-dicated that the fault systems of the Yubei region in Tarim Basin are dominated by thrust faults .These thrust faults occur in two horizons .One is the basement where the thrusts consist basement fault zone ( or basement weak zones ) .The other is the Cambrian-Ordovician carbonates where a thrust zone occurs .The Yubei fault system consists of a series of NEE-trending thrust zones including Yubei No .7,Yubei No.1,Yudong No.1,Yu-dong No.2,Yudong No.3 and Yudong No.4.Each single thrust belt is often composed of one main thrust and a set of associated secondary thrust faults .The fault plane of the main fault dips steeply at the upper part and flattens towards the deeper part ,and detaches in the Mid-Lower Cambrian salt la-yers.The main thrust and its associated secondary back-thrusts commonly form pop-up fault assemblage showing “fault-horse” geometry on profile .These fault zones in the Cambrian-Ordovician carbonate rocks were mainly formed in the mid-Caledonian ,experiencing movement of the early-epoch ( the Early Ordovician Penglaiba stage ) ,Ⅰ-epoch ( the Mid-Early-Ordovician Yingshan stage ) , and Ⅲ-epoch ( the Late-Ordovician ) of the mid-Caledonian .The fault movement was very weak in the Hercynian .The fault zones are characterized by significant segmented deformation .The fault system and ma-jor unconformities jointly control the vertical structural layering .
