本文關(guān)鍵詞：渤中凹陷古近紀控盆斷裂的活動速率與沉積響應(yīng)　出處：《海洋地質(zhì)與第四紀地質(zhì)》2016年04期 　論文類型：期刊論文

  更多相關(guān)文章： 斷裂 活動速率 沉積體系 古近紀 渤中凹陷

【摘要】：渤中凹陷是整個渤海灣盆地的沉積和沉降中心,古近紀時期被石臼坨凸起、沙壘田凸起、渤南低凸起、渤東低凸起所環(huán)繞。凸起與凹陷之間因控盆斷裂發(fā)育程度及活動速率的差異,形成復雜的構(gòu)造帶與沉積體系。在地震精細解釋基礎(chǔ)上,計算主要邊界斷裂在不同時期的活動速率,并與相應(yīng)時期平面沉積體系的展布特征相對比。結(jié)果表明,渤中地區(qū)古近紀的控盆斷裂活動速率峰值出現(xiàn)在沙三段和東三段沉積時期,凹陷處于強烈斷陷期,且因平面上不同位置斷裂活動強度的差異,凹陷在空間上并非呈簡單的"平底鍋"形態(tài)。盆緣碎屑沉積體系類型明顯受控于斷裂內(nèi)側(cè)的基底沉降速率,并隨活動速率的大小變化而發(fā)生退積或進積。與環(huán)渤海灣陸上油田所處各凹陷古近紀的構(gòu)造沉積演化相比,在東三段沉積期發(fā)生的最強烈斷陷和在東二上-東一段沉積期發(fā)生斷坳轉(zhuǎn)換以后,成為整個渤海灣盆地遠源三角洲的進積中心,是渤中凹陷古近紀構(gòu)造沉積演化方面最突出的特征。
[Abstract]:Bozhong sag is the sedimentary and subsidence center of the whole Bohai Bay basin. It was raised by Shiyutuo, Shalieda and Bonan low uplift in Paleogene. The complex tectonic belt and sedimentary system formed between the uplift and the depression because of the difference of the development degree and activity rate of the fault in the controlling basin, and on the basis of the detailed seismic interpretation. The activity rates of the main boundary faults in different periods are calculated and compared with the distribution characteristics of the plane sedimentary systems in the corresponding periods. In the Paleogene of Bozhong area, the peak rate of faulting activity occurred in the sedimentary period of the third member of Sha 3 and the third member of the east part, and the depression was in the period of strong fault subsidence, and the intensity of fault activity varied in different positions on the plane. The sag is not a simple "pan" form in space. The type of detrital sedimentary system in the basin margin is obviously controlled by the rate of basement subsidence inside the fault. And with the change of the activity rate, the deposition or precession occurs, which is compared with the tectonic sedimentary evolution of Paleogene in the depression located in the Bohai Bay onshore oil field. After the strongest fault depression occurred in the sedimentary period of the third member of the eastern part and the fault-depression transition occurred during the sedimentary period of the upper and eastern part of the East second member, it became the precession center of the far source delta of the whole Bohai Bay basin. It is the most prominent feature of Paleogene tectonic sedimentary evolution in Bozhong sag.
【作者單位】： 中國石油大學(華東)地球科學與技術(shù)學院;大慶油田采油八廠;中海石油(中國)有限公司天津分公司;
【基金】：國家“十二五”科技重大專項“渤中凹陷油氣成藏規(guī)律及勘探方向研究”(2011ZX05023-001-013)
【分類號】：P736.1
【正文快照】： 渤中凹陷是渤海灣盆地的沉積和沉降中心,也是整個渤海灣盆地最大的含油氣凹陷[1-2]。受勘探程度的限制,盡管從20世紀80年代以來,陸續(xù)有學者對渤中凹陷古近系的構(gòu)造和沉積演化進行了研究[3-6],但在研究范圍或研究程度上都存在明顯不足。近年來隨著鉆井數(shù)量的迅速增多和三維地震，

本文編號：1440357