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塔西南坳陷寒武系玉尔吐斯组烃源岩分布及发育模式认识是油气成藏的关键因素。利用盆地大测线恢复震旦纪末盆地古地貌,结合盆地内钻穿寒武系的11口钻井揭示信息,对比塔西南坳陷与北部坳陷震旦系—寒武系地震相特征,认为震旦纪末巴楚—麦盖提斜坡地区抬升,沉积水体较浅,在基底之上沉积了一套潮坪沉积,以其作为碳酸盐岩枢纽带南北两侧的塔西南坳陷和北部坳陷均发育震旦系—寒武系;震旦系沉积之上往往有寒武系玉尔吐斯组沉积,玉尔吐斯组的沉积与基底古地貌有关,基底隆起高部位无沉积。研究认为塔西南坳陷原地有玉尔吐斯组烃源岩发育,在麦盖提斜坡分布局限,受控于早加里东期正断层形成的洼槽,坳陷中段裂陷槽内烃源岩最为发育;昆仑山前区发育盆地相寒武系烃源岩,分布于震旦系楔状体之上,可与满加尔凹陷烃源岩发育特征对比。
Source rock distribution and understanding of development pattern of Cambrian Yurbuosi Formation in the southwestern Tarim Basin is the key factor of hydrocarbon accumulation. Based on the data from the large survey of the basin to restore the paleolatoproduction at the end of the Sinian basin and the revelation of 11 drilling data through the Cambrian-Cambrian intra-basin drilling, the characteristics of the Sinian-Cambrian seismic facies in the southwest depression and the northern depression are compared. At the end of Sinian, the Bachu-Maigaiti slope area was uplifted and the sedimentary body of water was shallower. A set of tidal flat sediments were deposited above the basement as a focal point of the carbonate south-north-south axis of the carbonate belt, In the depression, the Sinian-Cambrian system developed. For the Sinian deposition, there is often the deposition of the Yultetu Formation in the Cambrian. The deposition of the Yü Tuusi Formation is related to the paleogeomorphology of the basement. There is no sedimentation in the upper part of the basement uplift. The study shows that the source rocks of the Yü Tu Tuo Formation in the Tarim Basin are developed in situ, and the distribution in the Maigaiti slope is controlled by the depressions formed by the normal faults in the Early Caledonian, the source rocks in the middle of the depression The rocks are the most developed. The Cambrian source rocks in the Kunlun piedmont developmental basin distribute over the Sinian wedges and can be compared with the source rocks in the Manjiaer Sag.