石油实验地质
石油實驗地質
석유실험지질
EXPERIMENTAL PETROLEUM GEOLOGY
2014年
4期
429-434,458
,共7页
推覆构造%调节断裂%油气%阜康凹陷%柴窝堡盆地%博格达山
推覆構造%調節斷裂%油氣%阜康凹陷%柴窩堡盆地%博格達山
추복구조%조절단렬%유기%부강요함%시와보분지%박격체산
nappe structure%adjustment fault%oil and gas%Fukang Sag%Chaiwopu Basin%Bogda Mountain
博格达山位于新疆北部，南、北两侧分别为吐哈盆地和准噶尔盆地夹持。博格达推覆构造是指博格达山的西段，由于与油气等矿产关系密切，一直引起人们的关注，但关于其组成与结构、成因机制和演化历史等尚不十分清楚。通过地表地质、勘探地震和大地电磁测深等资料的综合研究，指出博格达推覆构造由近东西向展布的柴窝堡盆地和博格达冲断隆起组成，前锋为阜康断裂，东、西两侧由近北东向延伸的乌鲁木齐-米泉断裂和达坂城-老奇台断裂2条调节断裂围限，底部主滑脱面位于中地壳，推覆体根部位于中天山北缘断裂。推覆构造从南向北由多条分支逆冲断裂分隔为变形特点各异的次级构造单元，构造样式自南向北由基底卷入型过渡到盖层滑脱型。博格达推覆构造的形成受控于准噶尔盆地向南的深俯冲作用，在侏罗纪末期至白垩纪早期已具雏形，白垩纪至古近纪又发生了向北的大规模逆冲推覆，新近纪以来再次向北强烈推覆并导致博格达山急剧隆升，最终形成现今构造面貌。阜康凹陷位于推覆构造前缘，构造稳定，油气保存条件优于推覆构造内的柴窝堡盆地，是寻找大中型油气藏的有利地区。
博格達山位于新疆北部，南、北兩側分彆為吐哈盆地和準噶爾盆地夾持。博格達推覆構造是指博格達山的西段，由于與油氣等礦產關繫密切，一直引起人們的關註，但關于其組成與結構、成因機製和縯化歷史等尚不十分清楚。通過地錶地質、勘探地震和大地電磁測深等資料的綜閤研究，指齣博格達推覆構造由近東西嚮展佈的柴窩堡盆地和博格達遲斷隆起組成，前鋒為阜康斷裂，東、西兩側由近北東嚮延伸的烏魯木齊-米泉斷裂和達坂城-老奇檯斷裂2條調節斷裂圍限，底部主滑脫麵位于中地殼，推覆體根部位于中天山北緣斷裂。推覆構造從南嚮北由多條分支逆遲斷裂分隔為變形特點各異的次級構造單元，構造樣式自南嚮北由基底捲入型過渡到蓋層滑脫型。博格達推覆構造的形成受控于準噶爾盆地嚮南的深俯遲作用，在侏囉紀末期至白堊紀早期已具雛形，白堊紀至古近紀又髮生瞭嚮北的大規模逆遲推覆，新近紀以來再次嚮北彊烈推覆併導緻博格達山急劇隆升，最終形成現今構造麵貌。阜康凹陷位于推覆構造前緣，構造穩定，油氣保存條件優于推覆構造內的柴窩堡盆地，是尋找大中型油氣藏的有利地區。
박격체산위우신강북부，남、북량측분별위토합분지화준갈이분지협지。박격체추복구조시지박격체산적서단，유우여유기등광산관계밀절，일직인기인문적관주，단관우기조성여결구、성인궤제화연화역사등상불십분청초。통과지표지질、감탐지진화대지전자측심등자료적종합연구，지출박격체추복구조유근동서향전포적시와보분지화박격체충단륭기조성，전봉위부강단렬，동、서량측유근북동향연신적오로목제-미천단렬화체판성-로기태단렬2조조절단렬위한，저부주활탈면위우중지각，추복체근부위우중천산북연단렬。추복구조종남향북유다조분지역충단렬분격위변형특점각이적차급구조단원，구조양식자남향북유기저권입형과도도개층활탈형。박격체추복구조적형성수공우준갈이분지향남적심부충작용，재주라기말기지백성기조기이구추형，백성기지고근기우발생료향북적대규모역충추복，신근기이래재차향북강렬추복병도치박격체산급극륭승，최종형성현금구조면모。부강요함위우추복구조전연，구조은정，유기보존조건우우추복구조내적시와보분지，시심조대중형유기장적유리지구。
Located between the Turpan-Hami Basin in the south and the Junggar Basin in the north in the northern Xinjiang, China, the Bogda Mountain extends in the east-west direction, and can be divided into the east and the west segments from Qitai according to geomorphology. The Bogda nappe structure refers to the western segment of the Bogda Mountain, and more attention has been attracted due to its close relationship with oil and gas and other minerals, yet its composition and texture, formation mechanism and evolutionary history are not very clear. The comprehensive analyses of field outcrops, seismic sections and magnetotelluric data show that the Bogda nappe structure mainly consists of the EW-trending Chaiwopu Basin and the Bogda anticlinorium, with the Fukang fault as the frontal boundary while the western and eastern boundaries are defined by the Urumqi-Miquan and Dabancheng-Laoqitai adjustment faults, respectively. The main detachment lies in the middle crust and the root fault is the northern boundary fault of the Middle Tianshan orogenic belt. The Bogda nappe structure is divided by faults into several sub-units with remarkably different features from south to north. Structural pattern changes from basement-involved structure in the south to cover detachment structure in the north. The formation of the Bogda nappe structure is controlled by the deep subduction of the Junggar Basin into the Bogda Mountain. Three evolution stages are identified, as known:rudiment from the Late Jurassic to the Early Cretaceous, large-scale nappe to the north from Cretaceous to Paleogene, and again large-scale nappe to the north which resulted in the strong uplifting of the Bogda Mountain ever since Neogene. Located in the front of the nappe structure and with better settings than the Chaiwopu Basin, the Fukang Sag is a favorable area for middle to large size oil pool exploration.
