Diagenesis and sedimentary environment of Miocene series in Eboliang III area

Sun, Guoqiang; Yin, Jigang; Zhang, Shuncun; Lü, Xianguo; Shi, Jingli

doi:10.1007/s12665-015-4530-4

Cited by 15 publications

(19 citation statements)

References 13 publications

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“…The clay minerals (<2 µm) in soil were separated by sedimentation and centrifugation as per GB7872‐87 standards . The clay minerals (<2 µm) were analyzed by X‐ray diffraction (XRD) according to SY/T5163‐2010 standards . The clay minerals(<2 µm) were ground and mixed with dry KBr powder, spectroscopic grade (1 mg of sample and 100 mg of KBr) and pressed into disks to prepare sample for FTIR analysis.…”

Section: Methodsmentioning

confidence: 99%

A Multi‐Element Mineral Conditioner: A Supplement of Essential Cations for Red Soil and Crops Growth

Chen

Shi

2016

CLEAN Soil Air Water

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A multi-element mineral conditioner (MMC) is a kind of slightly alkaline soil conditioner prepared by calcining a mixture of calcium or magnesium-based desulfurized flue gas residue, potassium feldspar, gypsum, dolomite, and limestone powder, rich in available K, Ca, Mg, Si, and other micronutrients. To evaluate the effect of MMC on the concentration of essential cations in red soil and in the crops grown thereon, a 4-month field experiment was conducted. By applying the MMC, the acidity of the red soil caused by weathering and chronic acid rain in Southern China can be neutralized, and the essential cations severely lacking in red soil and crops can be adequately replenished. Due to the addition of essential cations to red soil, the 1:1 type clay mineral gradually transformed into 2:1 type clay mineral. The grain yield was increased and the quality of rice was improved. The concentrations of Pb, Cd, Hg, and As in rice grains grown in the treated soil was significantly decreased. These results demonstrate that use of MMC can ameliorate soil and improve its fertility, reduce the reliance of crops on chemical fertilizers, raise the rice yield and improve the quality of red soil.

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Section: Methodsmentioning

confidence: 99%

A Multi‐Element Mineral Conditioner: A Supplement of Essential Cations for Red Soil and Crops Growth

Chen

Shi

2016

CLEAN Soil Air Water

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“…High CaCO 3 levels in a closed or semi-enclosed inland lake during the early stages of chemical deposition represent an arid climate, whereas low CaCO 3 levels represent a relatively humid climate [38][39][40]. Ca 2+ and Mg 2+ commonly exchange for one another but the large ionic radius of Ca 2+ enhances its migration.…”

Section: Major Element Analysismentioning

confidence: 99%

“…Comparison of major oxides measured in samples and those of the average shale[40]. (EF (enrichment factor) = Csediment/Cstandard rock).…”

mentioning

confidence: 99%

Clay Minerals and Element Geochemistry of Clastic Reservoirs in the Xiaganchaigou Formation of the Lenghuqi Area, Northern Qaidam Basin, China

et al. 2019

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We performed mineralogical and geochemical analyses of core samples from the Lenghuqi area in the northern marginal tectonic belt of the Qaidam Basin. The clay mineralogy of the Xiaganchaigou Formation sandstone is dominated by I + I/S + C types and characterized by high illite, a higher mixed-layer illite/smectite and chlorite, lesser smectite, and an absence of kaolinite. The clay minerals reflect that the Oligocene sedimentary basin formed in an arid-semi-arid climate with weak leaching and chemical weathering, and that diagenesis occurred in a K+- and Mg2+-rich alkaline environment. Measured major oxide concentrations show clear correlations. The lower Xiaganchaigou Formation is representative of a dry and cold freshwater sedimentary environment, whereas the upper Xiaganchaigou Formation is warmer and more humid. Trace element and rare earth element variations indicate that the paleoclimate conditions of the lower Xiaganchaigou Formation sedimentary period were relatively cold and dry, while the upper Xiaganchaigou Formation formed under warmer and more humid climate conditions. These findings reflect a global climate of a cold and dry period from the late Eocene to early Oligocene, and a short warming period in the late Oligocene.

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“…The Eboliang area in the north of the basin, which comprises a significant structural belt and is a major target for hydrocarbon exploration and development [26]. However, to date, exploration in Eboliang has been limited because the main controlling factors of the reservoir quality have not been thoroughly studied, and only a few studies have been conducted on the Lulehe sandstone mainly focusing on different aspects, including sedimentary facies [27], heavy mineral characteristics and source analysis of the depositional environment [28][29][30][31][32]. These previous studies have shown that the Lenghu area is adjacent to source rocks, with sufficient oil sources in contact with sandbodies, and has become a key area for extended exploration at the north margin of the Qaidam Basin.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the main objectives of this study are to (1) investigate the main diagenetic minerals and identify the origin and source of cements and clay minerals; (2) analyze the evolution of diagenesis and reconstruct the history and paragenetic sequences of diagenesis; and (3) identify how difference in diagenetic alteration impact reservoir quality. and (c) tectonic structures and wells in the study area (modified after Sun [27]). EBL: Eboliang structure; LH: Lenghu structure; MB: Mabei structure; NBX: Nanbaxian structures.…”

Section: Introductionmentioning

confidence: 99%

Origin and Sources of Minerals and Their Impact on the Hydrocarbon Reservoir Quality of the PaleogeneLulehe Formation in the Eboliang Area, Northern Qaidam Basin, China

et al. 2019

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The Lulehe sandstone in the Eboliang area is a major target for hydrocarbon exploration in the northern Qaidam Basin. Based on an integrated analysis including thin section analysis, scanning electron microscopy, X-ray diffraction, cathodoluminescence investigation, backscattered electron images, carbon and oxygen stable isotope analysis and fluid inclusion analysis, the diagenetic processes mainly include compaction, cementation by carbonate and quartz, formation of authigenic clay minerals (i.e., chlorite, kaolinite, illite-smectite and illite) and dissolution of unstable materials. Compaction is the main factor for the deterioration of reservoir quality; in addition, calcitecement and clay minerals are present, including kaolinite, pore-filling chlorite, illite-smectite and illite, which also account for reservoir quality reduction. Integration of petrographic studies and isotope geochemistry reveals the carbonate cements might have originated from mixed sources of bioclast- and organic-derived CO2 during burial. The quartz cement probably formed by feldspar dissolution, illitization of smectite and kaolinite, as well as pressure solution of quartz grains. Smectite, commonly derived from alteration of volcanic rock fragments, may have been the primary clay mineral precursor of chlorite. In addition, authigenic kaolinite is closely associated with feldspar dissolution, suggesting that alteration of detrital feldspar grains was the most probable source for authigenic kaolinite. With the increase in temperature and consumption of organic acids, the ratio of K+/H+ increases and the stability field of kaolinite is greatly reduced, thereby transforming kaolinite into mixed layer illite/smectite and illite. Within the study area, porosity increases with chlorite content up to approximately 3% volume and then decreases slightly, indicating that chlorite coatings are beneficial at an optimum volume of 3%. A benefit of the dissolution of unstable minerals and feldspar grains is the occurrence of secondary porosity, which may enhance porosity to some extent. However, the solutes cannot be transported over a large scale in the deep burial environment, and simultaneous precipitation of byproducts of feldspar dissolution such as authigenic kaolinite and quartz cement will occur in situ or in adjacent pores, resulting in heterogeneity of the reservoirs.

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Diagenesis and sedimentary environment of Miocene series in Eboliang III area

Cited by 15 publications

References 13 publications

A Multi‐Element Mineral Conditioner: A Supplement of Essential Cations for Red Soil and Crops Growth

A Multi‐Element Mineral Conditioner: A Supplement of Essential Cations for Red Soil and Crops Growth

Clay Minerals and Element Geochemistry of Clastic Reservoirs in the Xiaganchaigou Formation of the Lenghuqi Area, Northern Qaidam Basin, China

Origin and Sources of Minerals and Their Impact on the Hydrocarbon Reservoir Quality of the PaleogeneLulehe Formation in the Eboliang Area, Northern Qaidam Basin, China

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