石油实验地质

NEW ASPECTS OF OIL AND GAS EXPLORATION IN HEXI CORRIDOR

Tan Shidian, Zhao Liusheng

1984, 6(4): 271-278. doi: 10.11781/sysydz198404271

Abstract(538) PDF-CN(254)

Abstract:
Jiuquan-Minle foredeep zone, covering an area of 19,0000 km², and with a thickness of sedimentary sequences up to 7,000 m or more, consists of three sedimentary basins,i.e. Jiuxi,Jiudong,and Minle basins. Large reserves of oil and gas have been found already in Jiuxi basin. Based on the data obtained recently and the experiences derived from expiorating practice in Jiuxi basin, three types of oil-bearing combination and five aspects of oil exploration are determined for the Jiuquan-Minle foredecp zone. Reserves initially in place of Jiuxi basin has been proved to be 160,000 ton per cubic kilometer of source rock. The relative high potential confirms tbat further prospecting of this region should be considered.

NOTED ON TYPES OF DELTAIC DEPOSITION OF LAKE BASIN IN SONGLIAO BASIN

Shi Guoping, Jiao Gefeng, Zhang Shulin

1984, 6(4): 279-286. doi: 10.11781/sysydz198404279

Abstract(466) PDF-CN(312)

Abstract:
Based on history of growing and declining of lake basin, deltas of Early Cretaceous lake basin in Song-Iiao basin are classified into three catagories : 1) Retreated deltas formed during lake transgression. 2) Prograded deltas formed during lake regression. 3) Fan deltas formed between lake transgression and regression. Describing different depositional processes, the diverse patterns of vertical facies sequences are shown as effective criteria for distinguishing the three types of deltas.

1984, 6(4): 287-287. doi: 10.11781/sysydz198442872

Abstract(464) PDF-CN(200)

Abstract:

1984, 6(4): 287-287. doi: 10.11781/sysydz198404287

Abstract(330) PDF-CN(171)

Abstract:

PRE-BASINING CONSTRUCTION OF SICHUAN BASIN AND ITS TRANSFORMATION

Han Yonghui, Guo Zhengwu

1984, 6(4): 288-297. doi: 10.11781/sysydz198404288

Abstract(449) PDF-CN(234)

Abstract:
By reviewing comprehensive geological data from Sichuan basin and adjacent areasopre-basining construction and main factors affecting them are studied. In the light of opening and closing of the ancient Tethys in China, the mechanism of formation and transformation of the basin is discussed and four relavant stages are identified as follows. 1) Stage of formation of the basement (pre-Sinian), when the basement was consolodated and turned into continental crust through pre-Sibao orogeny (1.700m.y. -1.900m.y.),Sibao orogeny (1.400m.y.) and Jinning movement (800m.y.). 2) Stage of uplifting of Chuanzhong-Kangdian-Yajiang crustal rise (pre-Permian) which, according to depositional characteristics, thicknesses, bio-assemblages and tectonic features of strata from Sinian to Carboniferous, is believed to be the westerly extention of Upper Yangtze plateform. 3) Stage of initiation of basinning (Permian to Middle Triassic), represented by disintegration of the thermogenic tectonic rise proposed above, the opening of the north branch of the ancient Tethys, the reversion of regional stress field (from compressional to tentional) and the variation of thermo-regime, all of which influenced the Chuanzhong rise in such a Way that denudation there was converted into subsidence, resulting in initiation of formation and evolution of the basin. 4) Stage of formation and evolution of the basin (Late Triassic), when predominant controlling factors for the basinning were the opening and closing of the ancient Tethys. Moreover, influences of other factors and margins on the evolution of the basin elsewhere are briefly described, characteristics of the basin during each stage and mechanism of subsidence are discussed and, subsequently, three promising prospects for petroleum are recommended.

GEOLOGICAL IMPLICATIONS OF TRACE FOSSILS

Xu Huaida

1984, 6(4): 298-310. doi: 10.11781/sysydz198404298

Abstract(509) PDF-CN(270)

Abstract:
Extremely abundant biogenic trace foosils exist within the sediments of all kinds from Late Precambrian to Presentday.ln respect of stratigraphy and sedi-mentology, it is quite meaningful to study them.In addition, trace fossils could. 1.Indicate compactness of sedimentary rocks, 2.Provide some clues to the drrectinns of ancient water currents during sedimentation and, 3.Be used to determine the top and bottom surfaces of rock formation.In this paper, implications of trace fossils are discussed with stress on their application to stratigraphy and sedrmentigraphy and sedimentology.

A PRELIMINARY STUDY ON COLOR ALTERATION OF CONODONT AND DIVISION OF MATURITY OF ORGANIC MATTERS IN ORDOVIAN SYSTEM NORTH CHINA

Bao Dexian, Wang Yuanshun

1984, 6(4): 311-318. doi: 10.11781/sysydz198404311

Abstract(505) PDF-CN(312)

Abstract:
The essential that caused color alteration of conodonts throughout North China are the maxium palaeo-geotemperature controlled by principle tectonic framework, whereas local color alteration of conodonts in some areas was affected by factors as follows. 1) buried rock masses whichintensified the color alteration of conodonts; 2) activities of underground water which degraded the color alteration of conodonts; 3) tectonic movement which intensified the color alteration of conodonts. By analyzing the history of color alteration of conodonts from Ordovician system, it is inferred that organic matters in this sequence reached mature stage during the period from the end of Permian to the beginning of Yanshan movement. After Yanshan movement, organic matters could be transferred into petroleum secondarily within some plain areas where Cenozoic strata had deposited. The whole region of North China is then devided and evaluated in terms of maturities of organic matters.

1984, 6(4): 319-324. doi: 10.11781/sysydz198404319

Abstract(488) PDF-CN(332)

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1984, 6(4): 325-335. doi: 10.11781/sysydz198404325

Abstract(417) PDF-CN(311)

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1984, 6(4): 336-343. doi: 10.11781/sysydz198404336

Abstract(415) PDF-CN(233)

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1984, 6(4): 343-343. doi: 10.11781/sysydz198404343

Abstract(420) PDF-CN(193)

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1984, 6(4): 344-350. doi: 10.11781/sysydz198404344

Abstract(577) PDF-CN(249)

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1984, 6(4): 351-351. doi: 10.11781/sysydz198404351

Abstract(398) PDF-CN(183)

Abstract:

1984, 6(4): 352-352. doi: 10.11781/sysydz1984043522

Abstract(380) PDF-CN(182)

Abstract:

1984, 6(4): 352-352. doi: 10.11781/sysydz198404352

Abstract(279) PDF-CN(179)

Abstract:

1984 Vol. 6, No. 4

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