本文应用层序地层学及沉积学理论在江陵凹陷中南部新沟咀组开展沉积体系综合

This paper uses sequence stratigraphy and sedimentology theory to carry out a comprehensive study of the sedimentary system in the Xingouzui Formation in the central and southern Jiangling Depression. Establish the isochronous sequence stratigraphic framework of the Xingouzu Formation in the study area; study the types of sedimentary facies and the distribution of sedimentary systems. The main conclusions and understandings obtained are as follows: <br>(1) Through core observation and description of core wells in Jiangling Depression, dark mudstone facies and variegated mudstones are identified as 12 types of rock facies and 8 types of rock facies. <br>(2) Through the analysis of core and well logging data, three main types of sedimentary facies, delta facies, freshwater lake facies and saline water lake facies, were identified in the Xingouzui Formation in Jiangling Depression. The main subfacies or microfacies are: lakeside, shallow lake, shallow lake sand bar, delta plain branch channel and inter-channel, delta front edge underwater branch channel, tributary bay, estuary sand bar, distant sand bar, etc. . <br>(3) On the basis of identifying the sedimentary facies, based on the analysis of the seismic emission interface, large lake flooding surface, and logging curve characteristics of the main seismic section of the basin, the stratigraphic superposition pattern of degenerating-accumulating and accumulating-advancing is determined In the study area, six sequence boundaries were identified in the Xingouzu Formation in the study area, and the Xingouzu Formation in Jiangling Depression was divided into XSQ1 (III oil group and mud barrier), XSQ2 (lower oil group II), XSQ3 CII oil group (Upper), XSQ4 CI oil group) and XSQS (new upper) 5 three-level sequence

In this paper, the theory of stratospheric stratigraphy and sedimentology was applied to carry out comprehensive research on sedimentation system in the xingou Tsui group in the south-central part of Jiangling depression. The isocheric sequence formation of the new trench tsui group in the study area was established, and the sedimentary phase type and sedimentary system were spread. The main conclusions and understandings were as follows:<br>(1) Through the observation and description of the heart of the heart well in the Jiangling depression, the combination of dark mud rock phase, mixed mud rock is equal to 12 kinds of rock phase and 8 kinds of rock phase.<br>(2) Through the analysis of core and well-sensing data, three main sedimentary phase types were identified in the new trench tsui group of Jiangling depression. Among the main development of subphase or micro-phase are: bin lake, shallow lake, shallow lake sand dam, delta plain branch river channel and river channel, delta leading underwater branch river channel, tributary bay, estuary sand dam, far sand dam and so on.<br>(3) On the basis of identifying the sedimentary phase, the seismic emission interface, large lake surface and logging curve characteristics of the basin trunk seismic profile were analyzed, and the formation overlay style of the de-accumulation and one accumulation was determined, and 6 sequence interfaces were identified in the new trench group in the study area. Jiangling depression New groove Tsui group is divided into XSQ1 (III oil group and mud compartment), XSQ2 (lower part of THE II oil group), XSQ3 CII oil group upper, XSQ4 CI oil group) and XSQS (new upper section) 5 three-stage sequence

In this paper, sequence stratigraphy and sedimentology are used to study the sedimentary system of Xingouzui Formation in the south central Jiangling depression. The isochronous sequence stratigraphic framework of Xingouzui Formation in the study area is established, and the sedimentary facies types and distribution of sedimentary systems are studied. The main conclusions and understandings are as follows:<br>(1) According to the core observation and description of the core of the core wells in Jiangling depression, 12 lithofacies and 8 lithofacies combinations of dark mudstone and variegated mudstone are identified.<br>(2) Based on the analysis of core and logging data, three main sedimentary facies types, delta facies, freshwater lacustrine facies and salt lacustrine facies, are identified in Xingouzui Formation of Jiangling depression. The main subfacies or microfacies are: lakeside, shallow lake, shallow lake sand bar, delta plain branch channel and inter channel, delta front underwater branch channel, tributary Bay, estuary sand bar, far sand bar, etc.<br>(3) On the basis of identifying sedimentary facies, through the analysis of the characteristics of seismic emission interface, large Lake flood surface and logging curve of the main seismic section of the basin, the stratigraphic superposition pattern of retrograde aggradation and aggradation progradation is determined. Six sequence interfaces are identified in the xingouju formation of the study area. The xingouju formation of Jiangling depression is divided into xsq1 (III oil formation and mud barrier), xsq2 Five third-order sequences (lower part of II oil formation), upper part of xsq3 CII oil formation, xsq4 CI oil formation) and xsqs (upper new member)