Development and Genetic Mechanism of Chepaizi-Mosuowan Uplift in Junggar Basin, China

He, Dengfa; Chen, Xinfa; Jun, Kuang; Zhou, Lu; Tang, Yong; Deguang, Liu

doi:10.1016/s1872-5791(08)60038-x

Cited by 45 publications

(40 citation statements)

References 5 publications

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“…In the early Cretaceous, the paleo uplift subsided steadily, forming anticlinal traps that were favorable for hydrocarbon accumulation. At the same time, the source rocks of the Middle Permian lower Urho Formation (P 2 w) located in the Pen1 well west sag were at their generation and expulsion peak, providing sufficient oil and gas for the anticlinal traps (He et al 2008;Ji et al 2010;Xiang et al 2016;Zhang et al 2010). Furthermore, the Yanshan movement was at an active stage, forming inherited normal faults above the Hercynian thrust faults, acting as a ''highspeed elevator'' for delivering oil and gas from the lower strata to the upper reservoirs.…”

Section: Geological Settingmentioning

confidence: 99%

A method for evaluating paleo hydrocarbon pools and predicting secondary reservoirs: a case study of the Sangonghe Formation in the Mosuowan area, Junggar Basin

Wei

Tao

2018

Pet. Sci.

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Taking the Jurassic Sangonghe Formation in the Mosuowan-Mobei area of the Junggar Basin as an example, this paper provides a method that evaluates paleo hydrocarbon pools and predicts secondary reservoirs. Through Quantitative Grain Fluorescence (QGF) experiments, well-tie seismic correlation, and paleo structure analysis, the scale and distribution of paleo hydrocarbon pools in the study area are outlined. Combining current structural features and fault characteristics, the re-migration pathways of paleo oil and gas are depicted. Based on barrier conditions on the oil re-migration pathways and current reservoir distribution, we recognize three types of secondary reservoirs. By analyzing structural evolution and sand body-fault distribution, the major control factors of secondary reservoirs are specified and, consequently, favorable zones for secondary reservoirs are predicted. The results are mainly as follows. (1) In the primary accumulation period in the Cretaceous, paleo hydrocarbon pools were formed in the Sangonghe Formation of the Mosuowan uplift and their size and distribution were extensive and the exploration potential for secondary reservoirs should not be ignored. Besides, paleo reservoirs were also formed in the Mobei uplift, but just small scale. (2) In the adjustment period in the Neogene, traps were reshaped or destroyed and so were the paleo reservoirs, resulting in oil release. The released oil migrated linearly northward along the structural highs of the Mobei uplift and the Qianshao low-relief uplift and then formed secondary reservoirs when it met new traps. In this process, a structural ridge cooperated with sand bodies and faults, applying unobstructed pathways for oil and gas re-migration. (3) The secondary hydrocarbon pools are classified into three types: low-relief anticlinal type, lithologic pinch-out type and fault block type. The distribution of the first type is controlled by a residual low uplift in the north flank of the paleo-anticline. The second type is distributed in the lithologic pinch-out zones on the periphery of the inherited paleo uplift. The third type is controlled by fault zones of which the strikes are perpendicular to the hydrocarbon re-migration pathways. (4) Four favorable zones for secondary reservoirs are predicted: the low-relief structural zone of the north flank of the Mosuowan paleo-anticline, the fault barrier zone on the western flank of the Mobei uplift, the Qianshao low-relief uplift and the north area of the Mobei uplift that parallels the fault zone. The study above effectively supports the exploration of the Qianshao low-relief uplift, with commercial oil discovered in the Qianshao1 well. Besides, the research process in this paper can also be applied to other basins to explore for secondary reservoirs.

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Section: Geological Settingmentioning

confidence: 99%

A method for evaluating paleo hydrocarbon pools and predicting secondary reservoirs: a case study of the Sangonghe Formation in the Mosuowan area, Junggar Basin

Wei

Tao

2018

Pet. Sci.

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“…No wells have reached the bottom of the Carboniferous System. The Tugulu group of the Cretaceous and Neogene Systems is widely distributed [16,17]. The Jurassic System is distributed locally and constitutes eroded debris deposited in gullies incised in the Carboniferous System.…”

Section: Geological Backgroundmentioning

confidence: 99%

Calcareous Interlayer Causes and Logging Identification for the Shawan Formation of the Chunfeng Oilfield

Hou¹,

Jin²,

Li³

et al. 2017

TOPEJ

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Background:Many sets of calcareous interlayers are present in the Shawan Formation in the Chunfeng oilfield, which leads to scattered residual oil that is difficult to extract. Objective:Observations of core samples and thin sections, analyses of trace element compositions and interpretations of logging data were used to identify the calcareous interlayers and identify their possible origin. Method:First, the petrologic characteristics of the calcareous interlayers were identified; then, we developed a quantitative function for identifying the calcareous interlayers based on well log data. Finally, the possible origin of these calcareous interlayers was identified based on these findings. Conclusion:The results show that the quantitative function has a high accuracy of 91.8% and average uranium content of calcareous interlayers can reach as high as 27×10 -6 , indicating that the quantitative identification function provided accurate identification of the calcareous interlayers, and highly radioactive uranium is one explanation for the origin of the calcium cementation.

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“…Five major uplifts were formed by tectonic evolutions, respectively, in the later stage of Early and Middle Ordovician, the late Ordovician, the late Middle Devonian, and the late Permian (He et al 2008, 2011; Lin et al 2011, 2012, 2013), which lead to complex and diverse stratigraphic features (Fig. 3).…”

Section: Paleozoic Tectonic Evolution and Paleokarst Developmentmentioning

confidence: 99%

“…3). Although there are debates on the geologic time for the uplifts in the southwest, center, and north Tarim Basin (Xu et al 2005; He et al 2008; Lin et al 2011), views on the four major unconformities (T 7 4 , T 7 0 , T 6 0 , T 5 0 ) are consistent (Xu et al 2005; He et al 2008, 2011; Lin et al 2011, 2012, 2013). The distribution and intensity of karstification were largely controlled by the unconformity surfaces.…”

Section: Paleozoic Tectonic Evolution and Paleokarst Developmentmentioning

confidence: 99%

Tectonic evolution and paleokarstification of carbonate rocks in the Paleozoic Tarim Basin

Chen

Chenglin

et al. 2016

Carbonates Evaporites

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Thick carbonate rocks were developed in the depression of the Tarim craton during the Cambrian–Middle Ordovician periods. The compressional tectonic movement during the Middle Caledonian–Hercynian created the paleouplifts, which became the base for the paleokarst in the Ordovician carbonate rocks. Based on the large quantity of seismic, drilling, and geological outcrop data, this study analyzed the paleokarst development in relation to the multi-stage tectonic movements in the Paleozoic Era and different stages of karstification and hypothesized paleogeomorphology and paleokarst water system of those stages. Fractures from the tectonic movements in the carbonate and non-carbonate rocks were essential for water cycle, and therefore, the karst development in deep carbonate rocks. Paleokarsts in the Tarim Basin can be classified into four major types based on the paleogeomorphology, degree of karstification, and the layering, i.e., Tahe type, gentle hill type, high steep hill type, and covered-semi-open type. Relatively, the Tahe type was mostly on hill slopes and had the strongest karstification, the gentle hill type often located in the plain areas or basin bottoms and had least karstification, the high steep hill type was controlled by faults and had medium karstification, the semi-open type was controlled by precipitation and hydraulic gradient, and fracture passages and karst caves were mostly developed along major fractures. Overall, the paleokarsts of the Ordovician carbonate rocks in the Tarim Basin can be characterized by long geologic history, multiple development stages, deep burial depth, and various karst types.

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Development and Genetic Mechanism of Chepaizi-Mosuowan Uplift in Junggar Basin, China

Cited by 45 publications

References 5 publications

A method for evaluating paleo hydrocarbon pools and predicting secondary reservoirs: a case study of the Sangonghe Formation in the Mosuowan area, Junggar Basin

A method for evaluating paleo hydrocarbon pools and predicting secondary reservoirs: a case study of the Sangonghe Formation in the Mosuowan area, Junggar Basin

Calcareous Interlayer Causes and Logging Identification for the Shawan Formation of the Chunfeng Oilfield

Tectonic evolution and paleokarstification of carbonate rocks in the Paleozoic Tarim Basin

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