Controlling factors of carbonate rock beach and bar development in lacustrine facies in the Chunxia submember of Member 4 of Shahejie Formation in south slope of Dongying Sag,Shandong Province
Song Guoqi1 Wang Yanzhang2 Lu Da3 Yan Ruiping3 Yang Jing4
1 Shengli Oilfield，SINOPEC，Dongying 257001，Shandong 2 Shengli Professional Academy in Shengli Oilfield，SINOPEC，Dongying 257000，Shandong 3 Research Institute of Exploration & Development of Liaohe Oilfield，PetroChina，Panjin 124010，Liaoning 4 Oil Production Technology Research Institute of Dagang Oilfield，PetroChina，Tianjin 300280
Abstract：The carbonate rock beach and bar is an important sedimentation type in rift lacustrine basin.This paper studies the control on the formation and distribution of carbonate rock beach and bar and studies the elements such as the palaeoclimate，palaeogeomorphology，palaeoprovenance，palaeowater depth，palaeosalinity，and puts forward the “five-palaeo” control model for the submember of Chunxia of Member 4 of Shabejie Formation in south slope of Dongying Sag, such as “the palaeoclimate is the background，palaeogemorphology and palaeoprovenance is the condition，palaeowater depth is the key，the palaeosalinity is the guarantee”.The evaporation in relatively dry and moderate temperature and thermal geologic climate environment is relatively powerful and is favourable for forming carbonate rocks of lacustrine facies.The subaqueous uplift and slope are the favorable area of carbonate rock beach and bar sedimentary facies.The lower degree of clastic rock source providing is the favorable locality of carbonate rocks development. The palaeowater depth of 3-32m or so is the main area for the carbonate rocks development.The palaeosalinity offers the substance guarantee for the carbonate rocks development and it controls the distribution of the dolomite and limestone.Using the dominant factor analysis the authors make sequence array on the controlling factors.The palaeogeomorphology is the main factor， provenances and palaeowater depth is the secondly，and the palaeosalinity is the factor with the lowest control.
Song Guoqi,Wang Yanzhang,Lu Da et al. Controlling factors of carbonate rock beach and bar development in lacustrine facies in the Chunxia submember of Member 4 of Shahejie Formation in south slope of Dongying Sag,Shandong Province[J]. JOPC, 2012, 14(5): 565-570.
