Objective China＇s petroleum exploration has entered a new stage of finding deeply buried thin sandbodies lbr the abundant oil resources they contain. Here thin sandbodies refer to those less than 10 m in thickness, ...Objective China＇s petroleum exploration has entered a new stage of finding deeply buried thin sandbodies lbr the abundant oil resources they contain. Here thin sandbodies refer to those less than 10 m in thickness, or even less than 1-2 m. It is difficult to depict thin-layer sandbodies of different genetic types using conventional core, well logging and seismic data due to their limited vertical resolution in petroliferous basins. However, seismic sedimentology provides a new research method especially tbr thin sandbody interpretation, i.e., validating interpreted sedimentary sandbodies from 3D seismic data based on horizontal resolution, stratal slice and seismic geomorphology interpretation. At present, a series of studies on seismic sedimentology in North America marine basins and elsewhere have been completed successfully and are relevant to the exploration and development of oil and gas fields.展开更多
With an area of 56×104km2, the Tarim Basin is the largest inland basin in China and is also generally acknowledged as one of the most important areas for potential oil and gas exploration. On the basis of data fr...With an area of 56×104km2, the Tarim Basin is the largest inland basin in China and is also generally acknowledged as one of the most important areas for potential oil and gas exploration. On the basis of data from 22 regional seismic profiles and 40 drilling wells, 15 important first-order and second-order regional unconformities were defined.Almost all the main unconformities are superimposed unconfomities. Since the Cambrian, 5 key periods of tectonic change have occurred during the evolution of the Tarim Basin. The total eroded stratal thickness of the above-mentioned unconformities was calculated by using the method of virtual extrapolation of seismic reflection. The results indicate that the total eroded stratal thickness of different periods is quite different in different locations of the basin. Taking the Upper-Middle Ordovician as an example, its thickness restoration of eroded strata was calculated into individual stages i.e. its thickness restoration of eroded strata was calculated to different tectonic periods. Otherwise, as for the specific period of tectonic change, the underlying strata were, respectively eroded and thus the thickness restoration of eroded strata was calculated into individual intervals. Taking the Early Hercynian period as an example, the eroded stratal thickness was calculated into individual intervals to calculate the ratio of intervals of various ages occupying the total eroded thickness. The results show that for the same stratum, its degree of erosion is quite different in different periods and at different locations, due to the varying influence of tectonic movement. The unconformities of some key periods of tectonic change have different controls on the degree of erosion and the eroded range of the individual period of the underlying strata which are the typical characteristics of multi-stage superimposition of unconformities in the Tarim Basin.展开更多
Hiatuses are ubiquitous in stratigraphic records at various temporal scales,but they cannot be easily identified and quantified owing to the lack of adequate methods in determining the duration of hiatuses or stratal ...Hiatuses are ubiquitous in stratigraphic records at various temporal scales,but they cannot be easily identified and quantified owing to the lack of adequate methods in determining the duration of hiatuses or stratal completeness.Here a processbased stratigraphic forward modeling(SFM)approach was used to effectively estimate the completeness of carbonate strata in three dimensions and at basin-scale.By using information derived from both spatial and temporal domains in the SFM outputs for five grid locations(pseudo wells)under different depositional settings,we were able to delineate basin-wide hiatuses of various temporal scales and determine their durations and stratal completeness quantitatively.The stratal completeness appears to be controlled by sea level changes,depositional environments,carbonate growth rates and tectonic subsidence patterns in various ways.展开更多
基金financially supported by the National Science Foundation of China(Grant No.41272133)
文摘Objective China＇s petroleum exploration has entered a new stage of finding deeply buried thin sandbodies lbr the abundant oil resources they contain. Here thin sandbodies refer to those less than 10 m in thickness, or even less than 1-2 m. It is difficult to depict thin-layer sandbodies of different genetic types using conventional core, well logging and seismic data due to their limited vertical resolution in petroliferous basins. However, seismic sedimentology provides a new research method especially tbr thin sandbody interpretation, i.e., validating interpreted sedimentary sandbodies from 3D seismic data based on horizontal resolution, stratal slice and seismic geomorphology interpretation. At present, a series of studies on seismic sedimentology in North America marine basins and elsewhere have been completed successfully and are relevant to the exploration and development of oil and gas fields.
基金funded by the Key Project of Chinese National Programs for Fundamental Research and Development (973 Program)"Hydrocarbon accumulation and distribution prediction of typical superimposed basin in China" (grant No. G1999043305)+1 种基金the Key Program of National Natural Science Foundation of China "Studies of continental margin dynamics and hydrocarbon resource potential of the South China Sea" (grant No. 40572067)"Palaeotectonic and palaeogeographic evolution and hydrocarbon accumulation in key changing period of the Paleozoic in the Tarim Basin" (grant No. 41130422)
文摘With an area of 56×104km2, the Tarim Basin is the largest inland basin in China and is also generally acknowledged as one of the most important areas for potential oil and gas exploration. On the basis of data from 22 regional seismic profiles and 40 drilling wells, 15 important first-order and second-order regional unconformities were defined.Almost all the main unconformities are superimposed unconfomities. Since the Cambrian, 5 key periods of tectonic change have occurred during the evolution of the Tarim Basin. The total eroded stratal thickness of the above-mentioned unconformities was calculated by using the method of virtual extrapolation of seismic reflection. The results indicate that the total eroded stratal thickness of different periods is quite different in different locations of the basin. Taking the Upper-Middle Ordovician as an example, its thickness restoration of eroded strata was calculated into individual stages i.e. its thickness restoration of eroded strata was calculated to different tectonic periods. Otherwise, as for the specific period of tectonic change, the underlying strata were, respectively eroded and thus the thickness restoration of eroded strata was calculated into individual intervals. Taking the Early Hercynian period as an example, the eroded stratal thickness was calculated into individual intervals to calculate the ratio of intervals of various ages occupying the total eroded thickness. The results show that for the same stratum, its degree of erosion is quite different in different periods and at different locations, due to the varying influence of tectonic movement. The unconformities of some key periods of tectonic change have different controls on the degree of erosion and the eroded range of the individual period of the underlying strata which are the typical characteristics of multi-stage superimposition of unconformities in the Tarim Basin.
基金supported by Chinese National Key R&D Project(Grant No.2019YFC0605501)Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA14010401)+1 种基金National Natural Science Foundation of China(Grant No.41821002)Shandong Provincial Natural Science Foundation,China(Grant No.ZR2018BD018)。
文摘Hiatuses are ubiquitous in stratigraphic records at various temporal scales,but they cannot be easily identified and quantified owing to the lack of adequate methods in determining the duration of hiatuses or stratal completeness.Here a processbased stratigraphic forward modeling(SFM)approach was used to effectively estimate the completeness of carbonate strata in three dimensions and at basin-scale.By using information derived from both spatial and temporal domains in the SFM outputs for five grid locations(pseudo wells)under different depositional settings,we were able to delineate basin-wide hiatuses of various temporal scales and determine their durations and stratal completeness quantitatively.The stratal completeness appears to be controlled by sea level changes,depositional environments,carbonate growth rates and tectonic subsidence patterns in various ways.
