【摘要】 <正> 广义的渤海湾盆地包括渤海海域及与之毗邻的下辽、济阳、黄骅等拗陷。本文的研究范围主要是海域。目的是利用地震地层学方法,结合钻井和测井资料,对地层划分、构造形成机制,古水流和古沉积体系和找油方向提出一些新的看法。更多还原

【Abstract】 This paper is based on seismic-stratigraphic principles and combined with informationof drilling data and logs. The results of study are given as follows: 1. Bohai Bay is a rift valley, where more tban 9 km of Cenozoic sediments has beendeposited. The Mesozoic used to be a stage of pull-apart and faulting depression; the LateCretaceous-Paleogene, a stage of pull-apart-arching-slumping, and the Neogene, a stage ofdepression. 2. In addition to three interregional unconformities, more than fifteen hiatuses havealso been found. They were resulted from the cyclic paleolake level fluctuation. The natureof the fluctuations is progressive, with water table rising slowly and falling suddenly and rapidly. As a result, the underlying strata are covered by the overlying strata in an onlapstyle. Therefore, at the edge of a sedimentary depression, the lower parts of every stratigra-phic unit are always omitted. 3. Four sedimentary depressions have been recognized. They are Liaodong, Bezhong,Laizhouwan, and Qikou depressions, in which six groups of paleodrainage and associatedsedimentary systems of Paleo-Liao, Paleo-Luan, Paleo-Huanghe (Yellow River), Paleo-Be-nan, and Paleo-Miaoxi rivers have been developed. The locations of these sedimentarysystems have an apparent heredity, and their evolution tends to be arranged from fan to fandelta, and finally, to delta. 4. The subaqueous fan, fan-delta, delta and fluvial channel sediments may form sedi-mentary anticlines of variou scale, especially the latter two types of sediments may formsome giant sedimentary anticlines extending for more than one hundred kilometers with awidth of tens kilometers. All of them may play an important role in controlling the occur-rences of oil and gas reservoirs. It suggests from the data available, that the best locationsfor the formation of oil and gas reservoirs are the middle part of a fan, the front of a fan-delta or a delta, the paleochannels adjacent to a paleoshoreline, and the bed-rock uplifts buried by a prodelta mud, or close to a prodelta. Some commercial oil fields have been disco-vered there from. 5. In the area of study, there are also some mudstone diapirs known as mud ridges.Some of them have distinctive bright spots at their top, indicating that they are also prospe-ctive objects for oil and gas exploration.更多还原