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Studying On Sequence Stratigraphy And Subtle Reservoir In BiYang Depression Of NanXiang Basin

Posted on:2003-05-09Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z ZhaoFull Text:PDF
GTID:1100360062986599Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
On the basis of the theory of Lacustrine Sequence stratigraphy, sedimentary , and petroleum geology , this paper having maked reserchment of identifying sequence stratigraphy , sedimentary system , sequence model and subtle reservoir by applicating log, seismic and various of analytical data in BiYang Lacustrine basin. The results from the research indicated that:1. Identifying 2 kinds high-resolution unit under the brine lake background in BiYang fault-depression:(1)the high-resolution unit under abyssal environment background(H3) consists of turbidite facies> mudstone facies , dolomite mudstone facies, salt-bearing dolomite facies, and trona facies .(2) the high-resolution unit under etang environment background(H2) consists of sandstone facies , aleurolitic mudstone facies, dolomite facies, salt-bearing dolomite facies and trona facies .the contributing factor model of salt-lake in BiYang fault-depression can be divided into 2 kinds: shallow water salt-lake model and deeper water salt-lake model. The main salt-lake forming period access on the period of lowstand and late highstand in the evolution of per sequence.2. A corrasion valley-topogenetic low fan sedimentary system was recognized in the low system tracts of sequence H33 and H32. The deposits in the corrasion valley have specific seismic reflection structure, sedimentary structure and depositional sequence. This paper presents the sedimentary mode of corrasion valley-topogenetic low fan sedimentary system. The corrasion valley developed on the boundary of the continental fault lake basin has specific genetic features and its formation was controlled by structural subsidence.3. Four types of sequences model were identified in the Hetaoyuan Formation, BiYang depression: adequate supply source tectonic slope-brea, poor supply source tectonic slope-break , hinge margin and salt-lake model.The research on corrasion valley ?topogenetic low fan and the fault slope break developed on deep depressed margin has outstanding significance on exploration of subtle reservoirs, and they are the favorable area of oil accumulation and new target of oil exploration in terrigenous fault-depression.4. Throuth the case studying of Shuanghe oil field ,this paper point out that the reservoir transport system especially the sandstone transport system has relevant to the evolution of sequence,the evolution of sequence controlling the permeate ability and oil filling ability of reservoir route.the diffirence of oil-rich degree has great relevant to the reservoir superiority permeatility anisotrophy. the braiding and lake flat sandstone in fan-delta are the superiority road in Shuanghe oil field and oil migrated along it.5. This paper has maked some progresses in predicting lowstand fan: firstly point out the important direction of explorating lawstand fan and the reservoir controlled model of tectonic slope-break. Synthesizing the relevant data of sequence stritigraphy ,this paper point out that the subtle reservoir forming model may be divided into 3 kinds and 10 sub-kinds. Along which .sandstone slope upper fray out reservoir in the basin margin fault slope break and corrassion lowstand fan reservoir forming model are the important kind subtle reservoir in Biyang depression.6. The thinking of applying sequence stratigraphy to subtle reservoir may be summarized as "four definating and one synthesizing",this paper point out the distribution law of lowstand subtle reservoir and predicted successly 3 lowstandfan.
Keywords/Search Tags:BiYang depression, sequence stratigraphy, sedimentary system corrasion valley, topogenetic low fan, slope-break, subtle reservoir
PDF Full Text Request
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