東營(yíng)凹陷滑塌型重力流沉積分布特征及三角洲沉積對(duì)其影響
[Abstract]:The delta deposition provides material source for the formation of slumping gravity flow, which has an important influence on the sedimentary distribution characteristics of the front slip gravity flow. Taking the delta-front sloughing gravity flow deposition in the middle part of the third member of Sha 3 in Dongying sag as the research object, using the data of drilling core, 3D earthquake, logging and analysis and testing, this paper summarizes the sedimentary characteristics of different types of sloughing gravity flow. The influence of delta as a material source on the formation, sedimentary type, sedimentary characteristics and distribution of slumping gravity flow is analyzed. The results show that there are four main types of gravity flow deposition in the study area: sliding rock, sloughing rock, clastic flow deposit and turbidite. The sedimentary structure, grain size and geophysical characteristics of different types are significantly different. Sand clastic flow deposits are the most developed in the study area, followed by sliding sloughing deposits, turbidity flow deposits and muddy clastic deposits. There are differences in the development degree and the common vertical sequence of gravity flow in different regions. The gravity flow types in the south slope of Boxing and Xin-133 blocks are mainly composed of sand clastic flow deposits, and the common multi-stage sand clastic flow deposits are adjacent or interphase vertical assemblages. The southern slope of Niuzhuang is similar to the central uplift zone, and the gravity flow type and vertical sequence are different from near to far, the sand clastic flow and turbidity flow are the main deposits in Ying11 block, and the turbidity flow ratio is higher than other blocks. The gravity flow type of single well in Feng14 block is relatively single, which is composed of sand clastic flow deposition or sloughing deposition. The sedimentary types and sedimentary characteristics of the sliding gravity flow are controlled by the percentage content of the sand and mud in the delta, the grain size of the delta sediment controls the size of the original programe angle, and the larger the forward accumulation angle is, the more developed the slip gravity flow is, but the closer the slip distance is. Under the control of the slope break point of the delta, the sliding sloughing deposit mainly distributes near the slope foot and the synsedimentary fault, the turbidite deposit mainly distributes in the deep water plain, and the clastic flow deposit distributes in the slope foot and deep water plain. The high accumulation rate in the delta promotes the formation of the sloughing gravity flow by reducing the internal friction force. The difference between the stacking rate and the tectonic subsidence rate also has an important effect on the vertical superposition and lateral continuity of the deposition of the sliding gravity flow.
【作者單位】: 中國(guó)石油大學(xué)地球科學(xué)與技術(shù)學(xué)院;青島海洋科學(xué)與技術(shù)國(guó)家實(shí)驗(yàn)室海底礦產(chǎn)資源功能實(shí)驗(yàn)室;中國(guó)勝利油田地質(zhì)科學(xué)研究院;
【基金】:國(guó)家重大科技專項(xiàng)(No.2011ZX05009-003) 中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(No.14CX06070A)
【分類號(hào)】:P512.2
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