Characteristics and genesis of quasi-stratified karst breccia of the Majiagou Formation in Ordos Basin
ZHANG Xinyue1,2, LI Ling1,2, ZHANG Daofeng3, YI Gang4, WU Dongxu5, ZHONG Shoukang1,2, YANG Mengying1,2, XIONG Ying1,2, XIAO Di1,2, TAN Xiucheng1,2
1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China; 2 Research branch of southwest petroleum university,key laboratory of carbonate reservoirs,CNPC,Chengdu 610500,China; 3 Research Institute of Exploration and Development,Changqing Oilfield Company of PetroChina,Xi'an 710021,China; 4 School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,Sichuan; 5 PetroChina Hangzhou Research Institute of Geology(HIPG),Hangzhou 310023,China
Abstract：Karst breccia with complex structural characteristics is widely developed in the Ordovician Majiagou Formation in Ordos Basin. It is found that the classical model can not explain the fabric and distribution characteristics of breccia,and the genetic mechanism is required further studied. Based on observation of cores and thin sections,different types of breccias of upper Ordovician Majiagou Formation in the eastern Sulige Gas Field are summarized and identified to clarify the spatial distribution,sequence structure characteristics and the formation mechanism. The results showed that(1)five types of breccia can be identified according to the occurrence and origin,including nearly in situ dissociation breccia(B1),near surface accumulation breccia(B2),cave accumulation breccia(B3),height(wall)fractured breccia(B4)and solution breccia(B5). They are multilayer overlapping in the vertical direction and have the “quasi stratified”characteristics which can be comparable in the horizontal direction;(2)The vertical configuration and evolution of different breccias are related to the periodical upward shallower sedimentary sequence and exposure dissolution,which can be classified into three types: main development type of B1,combined development type of B2-B3-B4 and main development type of B5;(3)The quasi-stratified breccia formed in the early diagenetic stage and was controlled by the high frequency sea level change under the background of low geomorphic relief,the multi-cycle superposition in the vertical direction,transverse migration and interlocking process of exposed dissolution lens. The research is helpful for understanding the characteristics and genesis of diversified karst breccia in Majiagou Formation,Ordos Basin,which also provides new materials for the study of dolomite karstification at the early diagenesis period.
ZHANG Xinyue,LI Ling,ZHANG Daofeng et al. Characteristics and genesis of quasi-stratified karst breccia of the Majiagou Formation in Ordos Basin[J]. JOPC, 2022, 24(4): 663-679.
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