石油实验地质

TYPICAL FEATURES AND GEQTECTONIC BACKGROUND OF THE FORMATION OF THE RENQIU BURIED-HILL OILFIELD

Chen Guoda, Fei Baosheng

1983, 5(4): 241-249. doi: 10.11781/sysydz198304241

Abstract(813) PDF-CN(386)

Abstract:
The Renqiu buried-hill oilfield is one of the large and Prolific oilfields in China discovered in the middle of 1970s. This type of oilfields was formed in a specific geotectonic background, which have their distinctive characteristics, and is a klnd of oil-formation assemblages of so-called "younger oil accumulated in older reservoirs",i.e. Cen-ozoic oil generated in geosag stage emplaced into older sub-Sinian and Paleozoic carbonate reservoirs formed in platform stage well developed with fractures and caverns. The pools have a variety of forms and are distributed regularly, resulting in the occurrence of multiple oil and gas accumulation zones. This paper discusses emphatically the formation of the oilfield in light of the geotectonic background, which provides informations significant to the search of oil and gas.

CHARACTERISTICS OF THE WAVY MOSAIC STRUCTURES AND THEIR CONTROL OVER THE OIL AND GAS FIELD IN THE QAIDAM BASIN

Tang Xiyuan, Jiang Hongxun, Xie Guangcheng

1983, 5(4): 257-264. doi: 10.11781/sysydz198304257

Abstract(1076) PDF-CN(380)

Abstract:
The frameworks of the wavy mosaic structure of the Qaidam basin were formed by the crossing of the NE-trending outer-pacific structural belts and the NW-trending paleo-Mediterranean belts, on which overlapped the EW and NS trending structures, and thus makes the structural frameworks complicated, wherein the NW-W trending is dominant. In the basin, the NW-W and NE trending structural belts can be subdivided into the second-order and third order crest and trough belts. The Qaidam basin is a stable ancient massif. It was principally a rise before Mesozoic. experienced the stage of minor rift-depressions during the Jurassic and Cretaceous period, and developed gradually into a large scale sedimentary basin of the present-day. An counter-clockwise rotation of the depocentre in this basin took place during the development of the crust-wave. The developments of the crustal movements like waves advancing one upon another and the frameworks of the mosaic structure in the Qaidam basin were in control of the stratigraphic thickness, facies-paleogeography, geological history and structural characteristics, and the distributions of various deposits including oil and gas deposits. This paper discusses these controls in details and evaluates the oil and gas potentials of the basin as a whole.

AN APPROACH TO THE SEDIMENTARY FACIES OF THE LARGE LACUSTRINE BASIN WATER-TRANSGRESSION DELTA IN SONGLIAO

Lin Yuxiu

1983, 5(4): 265-275. doi: 10.11781/sysydz198304265

Abstract(584) PDF-CN(313)

Abstract:
This article discusses the sedim entary features of the delta of the Salatu and Putaohua pays, exemplifying by the Bei'an-Xingshugang Delta with the most plentiful informations available. It is pointed out that the delta in the Putaohua pay in K₁y¹ is a lacustrine water-transgression delta, whereas that in K₁y^1-2 and K₁y³ is one with a lacustrine water-transgressive background, and the sand bodies in Sa0 and SaI formations are of turbidity deposits. Patterns of both facies and the sand bodies are also covered.

PRELIMINARY APPROACH TO ENVIRONMENTAL INDICATORS OF DOLOMITZATION

Chen Yanhua, Sun Tuo, Liu Ying

1983, 5(4): 276-284. doi: 10.11781/sysydz198304276

Abstract(777) PDF-CN(249)

Abstract:
This paper discusses types of the textures, petrology of dolomite, stable carbon and oxygen isotopic compositions and trace elements of the major members of Meso-Paleozoic dolomite in Jiangsu, Anhui, Hunan, Hubei, Sichuan and Yunnan provinces. Through this study, we came to know that the textures of dolomite can serve as objective sign of the environment of dolomitzation, and stable isotopic compositions of carbon and oxygen and trace elements can throw light on the properties of the medium of dolomitzation. These data can be regarded as important environmental indicators of dolomitzation. This paper also studies conditions and factors for retaining original fabric of calcium carbonate in dolomite from viewpoint of the environment.

1983, 5(4): 285-288. doi: 10.11781/sysydz198304285

Abstract(631) PDF-CN(259)

Abstract:

STUDY ON AGE OF A SPORO-POLLEN ASSEMBLAGE WITH NORMAPOLLES AND PRATEACEOUS

Hao Yuhong, Chen Minmin

1983, 5(4): 289-297. doi: 10.11781/sysydz198304289

Abstract(612) PDF-CN(272)

Abstract:
Informations provided in this paper were from the anhydrite-containing mud-stone in the upper Menli formation of the Sanmenxia basin. The assemblage studied here has a variety of Normapolles, such as Nu-dopollis, Basopollis, Complexiopollis, Plicapollis, Sporopollis, Vacuo-pollis, etc., containing abundant pollen of proteaceae of over ten kinds with a concentration of 13%. The flourishing and declining of proteaceae plants on the Northern Hemisphere were not consistent during geological history. They began to flourish in Maestrichtian-Danian in Siberia of Soviet Union and the pacific coastal area of North America and gradually extincted out in Paleocenc. During Paleocene, they were thriving in the long and narrow zone trending E-W from central China westward to central kazakhstan of Soviet Union. Four new species and genuses of Diervillopol-lenites magniatrium, Lonicerapollis arcuatus, Proteacidites pustulatus and Dipsacuspollenites sanmenxiaensis are given in this paper.

1983, 5(4): 298-303. doi: 10.11781/sysydz198304298

Abstract(564) PDF-CN(281)

Abstract:

1983, 5(4): 304-307. doi: 10.11781/sysydz198304304

Abstract(551) PDF-CN(300)

Abstract:

1983, 5(4): 308-312. doi: 10.11781/sysydz198304308

Abstract(495) PDF-CN(268)

Abstract:

1983 Vol. 5, No. 4

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